Synonyms of stand by

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

Verb

1. stand by, refrain, forbear

usage: not act or do anything; "He just stood by when the police beat up the demonstrators"

2. stand by, stick around, stick about, wait

usage: be available or ready for a certain function or service

3. stand by, stick by, stick, adhere, be

usage: be loyal to; "She stood by her husband in times of trouble"; "The friends stuck together through the war"

Adjective

1. standby, secondary (vs. primary)

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