Standby vs. Stand By
“Standby” is the usual closed noun/adjective in Cambridge, with “stand-by” documented as a Business English variant. “Stand by” is the two-word phrasal verb.
Use “standby” as the usual closed noun or adjective for something ready for use; Cambridge Business English also records “stand-by.” Use “stand by” as the phrasal verb when someone waits ready, supports someone, or maintains a position.
Key details
Choose the right form
| Role | Use | Example |
|---|---|---|
| Noun or adjective meaning ready/available | standby | a standby generator / remain on standby |
| Documented Business English noun variant | stand-by | a stand-by arrangement |
| Phrasal verb | stand by | Please stand by / stand by your decision |
Quick tests
Verb test
Can the expression take verb tense or inflection in this sentence?
If yes: Use the spaced phrasal verb “stand by.”
If no: If it names or modifies something ready for use, the noun/adjective form “standby” is usually appropriate; a documented hyphenated variant also exists.
Caveat: The hyphenated noun variant is documented, so house style can matter for nouns; the phrasal verb remains two words.
Examples
Keep a standby generator ready.
“Standby” modifies the noun generator.
Please stand by while we reconnect the call.
The expression functions as a phrasal verb.
The team will standby for instructions.
Better: The team will stand by for instructions.
As a verb, use two words.
Further guidance
Core difference
Use the documented noun or modifier form when naming a thing, result, event, or concept; use the spaced form when the words function as a verb.
Fast Test
If the expression can take ordinary verb tense or inflection in the sentence, the spaced verb form is usually the relevant choice.
Variant Boundary
Cambridge records closed “standby” as a noun/adjective, documents “stand-by” as a Business English variant, and records “stand by” as the phrasal verb.
Sources and evidence
Sources are shown with the role they play in this guide. Historical or style-sensitive claims are kept within the evidence boundary described above.
- STANDBY — English meaning (opens in a new tab)Cambridge Dictionary · Closed noun/adjective “standby” and documented Business English “stand-by” variant
- STAND BY SOMEONE — English meaning (opens in a new tab)Cambridge Dictionary · Two-word phrasal verb “stand by”