[kahy-bosh, ki-bosh]
noun Informal.
put the kibosh on, to put an end to; squelch; check: Another such injury may put the kibosh on her athletic career.

1830–40; of obscure origin Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
kibosh or slang kybosh (ˈkaɪˌbɒʃ)
1.  put the kibosh on to put a stop to; prevent from continuing; halt
2.  (tr) to put a stop to
[C19: of unknown origin]
kybosh or slang kybosh
[C19: of unknown origin]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1836, kye-bosk, in slang phrase put the kibosh on, of unknown origin, despite intense speculation. Looks Yiddish, but origin in early 19c. English slang seems to argue against this. One candidate is Ir. caip bháis, caipín báis "cap of death," sometimes said to be the black cap a
judge would don when pronouncing a death sentence, but in other sources identified as a gruesome method of execution "employed by Brit. forces against 1798 insurgents" [Bernard Share, "Slanguage, A Dictionary of Irish Slang"]. Or it may somehow be connected with Turkish bosh (see bosh).
Online Etymology Dictionary, © 2010 Douglas Harper
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Slang Dictionary

kibosh definition

[ˈkɑɪbɑʃ] or [kəˈbɑʃ]
  1. tv.
    to end something; to squelch something. : Please don't try to kibosh the scheme this time.
  2. n.
    the end; the final blow; the thing that terminates something. (Usually with the. See also put the kibosh on (sth).) : They thought the kibosh was overdone.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition.
Copyright 2007. Published by McGraw-Hill Education.
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