flick knife

noun

1. ***
   a knife with a blade inside the handle that jumps out quickly when a button is pressed

1. During the fight with a rival gang he lashed out with his flick knife
   在与敌对帮派的打斗中，他挥舞着弹簧折刀一通猛刺。
2. In Fisher v Bell ( 1961), it was held that the display of a "flick knife" in a shop window with a price attached was an invitation to treat.
   在Fisher诉Bell（1961）一案中，法院判决在商店橱窗里展示的标价的***也属要约邀请。

noun

1. a pocketknife with a blade that springs open at the press of a button

   Synonym:    switchbladeswitchblade knifeflick-knife