standby

or stand-by

[ stand-bahy ]
/ ˈstændˌbaɪ /

noun, plural stand·bys.

a staunch supporter or adherent; one who can be relied upon.
something upon which one can rely and therefore choose or use regularly.
something or someone held ready to serve as a substitute, especially a radio or television program used as a filler in case of cancellation of a regularly scheduled program.
a traveler who is waiting for last-minute accommodations to become available on a plane, train, or other transport as a result of a cancellation.

adjective

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Idioms for standby

    on standby, in a state of readiness to act, respond, or be used immediately when needed.

Origin of standby

First recorded in 1790–1800; noun, adj. use of verb phrase stand by
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

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