Quash(verb)
To officially say that a decision made by a court is no longer legally acceptable or correct.
Hindi meaning:अमान्य घोषित करना
Synonyms: Overturn, Suppress, Repress, Invalidate
Antonyms: Validate, Permit, Approve, Allow
Example: His conviction was later quashed by the Court of Appeal.
Trick to remember: Digital currency ki wajah se cash quash ho skta hai. 
