Synonyms of standby

Noun

1. standby, thing

usage: something that can be relied on when needed

2. understudy, standby, actor, histrion, player, thespian, role player

usage: an actor able to replace a regular performer when required

Adjective

1. standby, secondary (vs. primary)

usage: ready for emergency use; "a standby generator"; "a standby crew"

Definition and meaning of standby (Dictionary)