switchblades

英

美 [ˈswɪtʃˌbleɪdz]

n.  按钮式弹簧刀
switchblade的复数

柯林斯词典

• (按钮式)弹簧小折刀
  Aswitchbladeis a knife with a blade that is hidden in the handle and that springs out when a button is pressed.

in BRIT, use 英国英语用 flick-knife

双语例句

• Illegally manufacturing, selling or carrying daggers, knives with three edges, switchblades or other types of controlled knives;
  （三）非法制造、贩卖、携带匕首、三棱刀、弹簧刀或者其他管制刀具的；