Part of speech:
Being, or having the nature of, a reserve or reserves
(Grammar) Relating to an auxiliary verb.
For use during emergencies:
Possessing some quality, or having been subject to some operation (as substitution), in the second degree; as, a secondary salt, a secondary amine, etc. Compare primary.
The definition of supplementary is something that is added on, or that completes something.
Used or held in reserve
A performer who understudies.
Find another word for standby. In this page you can discover 9 synonyms, antonyms, idiomatic expressions, and related words for standby, like: reserve, auxiliary, backup, emergency, secondary, supplemental, supplementary, increase and understudy.