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standby

[stand-bahy] /ˈstændˌbaɪ/
noun, plural standbys.
1.
a staunch supporter or adherent; one who can be relied upon.
2.
something upon which one can rely and therefore choose or use regularly.
3.
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.
4.
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
5.
kept readily available for use in an emergency, shortage, or the like:
a standby player.
6.
of or pertaining to last-minute accommodations, the transport that offers them, or a traveler who is waiting for them:
a standby flight.
7.
of or pertaining to a waiting period.
Also, stand by.
Idioms
8.
on standby, in a state of readiness to act, respond, or be used immediately when needed.
Origin
1790-1800
1790-1800; noun, adj. use of verb phrase stand by
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Idioms and Phrases with on standby
Ready and waiting, as in We've got three more painters on standby. This expression originated in the navy in the 1940s, where it referred to someone being ready to come on duty as soon as required. From about 1960 it began to be widely used in aviation for a passenger waiting to take the first available seat on a full flight.
The American Heritage® Idioms Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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