noun
switchblade; flick knife
A knife whose blade springs out when a button or lever is pressed.
彼はポケットから飛び出しナイフを取り出した。
He took a switchblade out of his pocket.
General term for 'knife'; 飛び出しナイフ specifically refers to a spring-loaded switchblade.
Compound of 飛び出し (tobidashi, 'jumping out') + ナイフ (naifu, 'knife'), describing the blade's spring-loaded action.