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| stand·by [ stánd b ] |
noun (plural stand·bys) |
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| Definition: |
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1. person or thing readily available: somebody or something that can always be relied on to be available and useful, especially if needed as a substitute or in an emergency
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2. travel unreserved ticket or passenger without reservation: an unreserved ticket or a passenger having no prior reservation on a mode of public transportation such as an aircraft
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adjective |
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| Definition: |
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1. held in reserve: able to be used as a replacement
  standby generator
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2. travel unreserved and subject to availability: made available, usually at a lower price, shortly before the departure of a flight when there are seats remaining unsold, or using a ticket made available in this way
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adverb |
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| Definition: |
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travel on standby basis: on the basis of having no prior reservation to travel
flew standby from Washington to Amsterdam
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| [Late 18th century] |
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on standby available for use or service if necessary
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