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
And that's one of the levers they are using to quash reform.
Security companies, cellular operators and phone makers are moving to quash
  these threats before they spiral out of control.
He quickly backed down, but that did not quash discontent.
The point is that a public university is supposed to nurture free speech and
  free thought, not quash them.
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