Quick answer: Rein is a noun (usually plural, "reins") for the strap used to control a horse, and figuratively means control or restraint: hold the reins; rein in spending. Reign is a noun or verb for a monarch's period of rule: Queen Victoria's reign lasted 63 years. Rain is a noun or verb for water falling from clouds: It's raining again. These three words are homophones — they sound identical (or nearly so) in almost every accent. For a fuller definition, see the Cambridge Dictionary entry for ‘rein’.
Comparison Table
| Word | Part of Speech | Meaning | Example |
|---|---|---|---|
| rein | noun (usually plural) | a long strap used to control and guide a horse; figuratively, control or restraint | She pulled gently on the reins. |
| reign | noun / verb | the period during which a monarch rules; to rule as king or queen | The king's reign began in 1953. |
| rain | noun / verb | water falling in drops from clouds; to fall as rain | Heavy rain is expected tomorrow. |
Using Rein
Rein is most often seen in its plural form, reins — the leather straps a rider holds to guide and control a horse. From this literal meaning, English developed a rich set of figurative expressions about control, restraint, and power.
The rider held the reins firmly as the horse trotted forward.
The new CEO has taken the reins of the company.
The government decided to rein in public spending.
Parents should give teenagers some free rein to make their own choices.
She struggled to rein in her frustration during the meeting.
Common Phrases with Rein
- hold the reins (to be in control)
- give (someone) free rein (to allow complete freedom of action)
- rein in (to restrain or bring under control)
- take up the reins (to take on a position of control or leadership)
Using Reign
As a noun, reign refers to the period of time during which a king, queen, or other monarch rules. As a verb, to reign means to hold the position of monarch and rule over a country. The word is also used figuratively to describe dominance in a field, as in "reigning champion."
Queen Victoria's reign lasted an extraordinary 63 years.
The king reigned over a vast and powerful empire.
Chaos reigned in the streets after the announcement.
She is the reigning world champion in the event.
During his reign, the kingdom expanded its borders significantly.
Common Phrases with Reign
- reign of terror (a period marked by cruelty and violence)
- reigning champion (the current holder of a title)
- let chaos/silence reign (figuratively, to dominate a situation)
Using Rain
Rain, the most familiar of the three, is the noun and verb describing water falling from clouds in drops. Like reign, it can also be used as a verb, as covered in this guide to English verb patterns, and it appears in many idiomatic weather-related expressions.
It's been raining heavily all afternoon.
We had to cancel the picnic because of the rain.
The forecast predicts light rain tomorrow morning.
Ideas began to rain down during the brainstorming session.
The desert region rarely sees any rain at all.
Common Phrases with Rain
- rain check (a postponement, or literal permission to attend a future event)
- rain or shine (regardless of weather conditions)
- it never rains but it pours (idiom: problems tend to arrive all at once)
Memory Tricks
Rein contains "rein" like "reindeer" — think of a rider holding reins to guide an animal. Reign contains "reign" — spot the "g" for "government" or "governing" a kingdom, since a monarch's reign is about governing. Rain is the shortest and simplest spelling — it is also the most common word of the three, describing everyday weather rather than horses or kings.
Common Mistakes
✗ The bank tried to reign in risky lending.
✓ The bank tried to rein in risky lending.
✗ The director was given free reign over the project.
✓ The director was given free rein over the project.
✗ The queen has rained for over twenty years.
✓ The queen has reigned for over twenty years.
✗ Can I take a reign check on dinner tonight?
✓ Can I take a rain check on dinner tonight?
Quick Check: Rein, Reign, or Rain?
Four questions — choose the correct word for each sentence.
1. “The government tried to ___ in public spending.”
2. “Queen Victoria's ___ lasted 63 years.”
3. “We cancelled the picnic because of the ___.”
4. “The director was given free ___ over the project.”
Frequently Asked Questions
What is the difference between rein, reign, and rain?
Rein is a noun (usually plural, "reins") for the strap used to guide a horse, and figuratively means control or restraint, as in "rein in spending." Reign is a noun or verb describing a monarch's period of rule, as in "the queen's reign" or "she reigned for decades." Rain is a noun or verb for water falling from clouds, as in "heavy rain" or "it's raining." All three are pronounced almost identically but have entirely different meanings.
Is it "free rein" or "free reign"?
The correct phrase is "free rein," meaning complete freedom of action, drawn from the image of loosening a horse's reins to let it move freely: "She gave her team free rein to design the campaign." "Free reign" is one of the most common spelling errors in English, likely because people associate freedom with royal power ("reign"), but the phrase's origin is entirely about horses and reins.
Is it "rein in" or "reign in"?
The correct phrasal verb is "rein in," meaning to restrain or bring something under control, again from the literal image of pulling on a horse's reins to slow it down: "The central bank moved to rein in inflation." "Reign in" is a very common but incorrect spelling, since "reign" refers to ruling as a monarch, not restraining.
What does "rain check" mean?
A "rain check" originally referred to a ticket allowing a spectator to attend a rescheduled outdoor event if it was cancelled due to rain. Today it is used figuratively to mean postponing an invitation to a later date: "Can I take a rain check on dinner tonight?" It is always spelled "rain," since it relates to weather, not to horses or monarchs.
What does "reign of terror" mean?
A "reign of terror" describes a period, often under a ruler or regime, marked by extreme violence, fear, and oppression. The phrase originates from the Reign of Terror during the French Revolution (1793-94). It uses "reign" because it describes a period of rule or dominance, even one built on fear rather than legitimate governance.
Can "reign" be used outside of royalty?
Yes. "Reign" is often used figuratively to describe dominance or supremacy in a non-royal context: "the reigning champion," "chaos reigned in the office," "her reign as the top scorer in the league." In each case, the word conveys a period of being dominant or in charge, extending the royal meaning metaphorically.
Why do rein, reign, and rain sound the same?
Rein, reign, and rain are true or near-true homophones in most English accents because they share the same vowel sound, even though they come from different linguistic roots — "rein" and "reign" both trace back to Latin (via French), while "rain" comes from Old English. English has many such homophone clusters, and this trio is one of the most frequently confused in writing.
Is "reign" ever a verb?
Yes, "reign" is commonly used as a verb meaning to rule as a monarch or to be dominant: "The king reigned for over 40 years"; "Silence reigned in the courtroom." This is distinct from "rain" as a verb (to fall as precipitation) and "rein" which is not typically used alone as a verb outside the phrasal verb "rein in."
How can I remember which spelling to use?
Picture a horse for "rein" — reins are the straps a rider holds, so anything about control or restraint of a person or system uses "rein" (as in "rein in" and "free rein"). Picture a crown for "reign" — a monarch reigns over a kingdom, so anything about ruling or dominance uses "reign." "Rain," the simplest and most common of the three, is reserved for weather.
What is the past tense of each verb form?
The past tense of "reign" (to rule) is "reigned": "The king reigned for three decades." The past tense of "rain" (to fall as precipitation) is "rained": "It rained heavily last night." "Rein" is rarely used as a standalone verb; its most common verb use is within the phrasal verb "rein in," whose past tense is "reined in": "The manager reined in the team's spending."