verb (used with object)
to put down or suppress completely; quell; subdue: to quash a rebellion.
to make void, annul, or set aside (a law, indictment, decision, etc.).

1300–50; Middle English quashen to smash, break, overcome, suppress < Old French quasser, in part < Latin quassāre to shake (frequentative of quatere to shake; cf. concussion); in part < Late Latin cassāre to annul, derivative of Latin cassus empty, void

unquashed, adjective

1. crush, squash, quench, repress.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
quash (kwɒʃ)
1.  to subdue forcefully and completely; put down; suppress
2.  to annul or make void (a law, decision, etc)
3.  to reject (an indictment, writ, etc) as invalid
[C14: from Old French quasser, from Latin quassāre to shake]

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

"to make void, annul, crush," early 14c., from O.Fr. quasser "to break, smash," from L. quassare "to shatter," frequentative of quatere "to shake" (pp. quassus). Meaning "suppress" is from M.L. quassare "make null and void," from L. cassus "empty, void," influenced by quassare.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
It can be enhanced or quashed as a result of specific relations and experience.
One puzzle is why the government has not quashed food prices by releasing more
  grain from its overflowing stockpiles.
But scientists quashed the ethicists' ruminations, telling them to stop
  inventing such scary scenarios.
Warrants can be quashed electronically upon notice from the division.
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