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Second-string and Back-up

second-string

adjective

  • Being a replacement or substitute for a regular member of a team.
    • usage: "a second-string pitcher"
WordNet 3.0 © 2006 by Princeton University
back-up
(DoD, NATO) In cartography, an image printed on the reverse side of a map sheet already printed on one side. Also the printing of such images.
Department of Defense Dictionary of Military and Associated Terms. 31 January 2011.
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