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A pocketknife having a spring-operated blade that opens instantly when a release on the handle is pressed. Also called switchblade knife, switch knife.
nAlso called (in Britain and certain other countries): flick knife
(Arms & Armour (excluding Firearms)) US and Canadian a knife with a retractable blade that springs out when a button is pressed
a pocketknife, the blade of which is held by a spring and can be released suddenly, as by pressing a button. Also called switch′blade knife′.