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re-up

[ree-uhp]
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verb (used with or without object), re-upped, re-up·ping. Military Informal.
  1. to reenlist.
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Origin of re-up

An Americanism dating back to 1905–10
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Word Origin and History for re-up

v.

"to re-enlist," 1906, U.S. armed forces slang, from re- "back, again" + up (v.) "enlist." Related: Re-upped; re-upping.

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Online Etymology Dictionary, © 2010 Douglas Harper