Breath or breathe: which is correct?

Correct
breath (noun) / breathe (verb)
Avoid
breath (as the verb: "breath deeply")
Avoid
breathe (as the noun: "take a breathe")
Summary

Correct: breath (noun) / breathe (verb) — Avoid: breath (as the verb: "breath deeply") / breathe (as the noun: "take a breathe"). Breath = the air taken into or sent out of the lungs (noun); breathe = to take air in and let it out (verb).

Part of speech
noun / verb
Source
Merriam-Webster

Why

Merriam-Webster: breath (no final e) is the noun, with a short vowel; breathe (final e) is the verb, with a long vowel — the same pattern as bath/bathe and cloth/clothe.

Examples

  • Take a deep breath before you speak.
  • Remember to breathe slowly.
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Checked against
Merriam-Webster / Oxford
Spelling authority
Merriam-Webster · Oxford English Dictionary / Oxford spelling · SCOWL
Commonly confused and non-standard forms
64
Dictionary
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