switchblade

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switchblade /ˈswɪtʃˌbleɪd/ noun
plural switchblades
switchblade
/ˈswɪtʃˌbleɪd/
noun
plural switchblades
Learner's definition of SWITCHBLADE
[count] chiefly US
: a knife that has a blade inside the handle which springs out when a button is pressed
called also (British) flick-knife