1. (v.t.)quash to put down or suppress completely; quell; subdue: to quash a rebellion.
2. quash to make void, annul, or set aside (a law, indictment, decision, etc.).
Etymology: (1300–50; ME: to smash; overcome < OF quasser, in part < L quassāre to shake (freq. of quatere to shake))
Definition of 'quash'
Princeton's WordNet
1. (verb)repress, quash, keep down, subdue, subjugate, reduce put down by force or intimidation "The government quashes any attempt of an uprising"; "China keeps down her dissidents very efficiently"; "The rich landowners subjugated the peasants working the land"
2. (verb)invalidate, annul, quash, void, avoid, nullify declare invalid "The contract was annulled"; "void a plea"
Definition of 'quash'
Webster Dictionary
1. (noun)quash same as Squash
2. (verb)quash to abate, annul, overthrow, or make void; as, to quash an indictment
3. (verb)quash to beat down, or beat in pieces; to dash forcibly; to crush
4. (verb)quash to crush; to subdue; to suppress or extinguish summarily and completely; as, to quash a rebellion
5. (verb)quash to be shaken, or dashed about, with noise
Definitions of quash 
