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English definition of “standby”

standby

noun [C/U]  /ˈstændˌbɑɪ/ (plural standbys) us  
something available for use when needed, or the state of being ready for use: I have several meals I use as standbys for unexpected company. Cary also has sought to put more contractors on standby for major storms. If you fly standby, you hold a ticket and are ready to travel when space becomes available on a flight.
Idioms
(Definition of standby from the Cambridge Academic Content Dictionary © Cambridge University Press)
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