quashyoudaoicibaDictYouDict
quash: [14] Quash goes back ultimately to Latin quatere ‘shake’ (source also of English rescue [14], which etymologically means ‘shake off, drive away’, and of concussion and percussion). From it evolved quassāre ‘shake to pieces, break’, which passed into Old French as quasser (its modern descendant is casser, from which English gets cashier ‘dismiss from the army’). English took quasser over as quash. Squash [16] comes ultimately from the Vulgar Latin derivative *exquassāre.
=> concussion, percussion, rescue, squash
rescue (v.)youdaoicibaDictYouDict
c. 1300, from stem of Old French rescorre "protect, keep safe; free, deliver" (Modern French recourre), from re-, intensive prefix (see re-), + escourre "to cast off, discharge," from Latin excutere "to shake off, drive away," from ex- "out" (see ex-) + -cutere, combining form of quatere "to shake" (see quash). Related: Rescued; rescuing.