switchblade
switchblade knife
flick-knife
flick knife

He reached into his pocket and took out the handle of a flick knife.

Therefore flick knives are now in the same category as truncheons and knuckledusters.

The woman is then seen opening a flick knife as the pair engage in a final courtship dance.

A flick knife gleamed as it slid out of his fist.

She reached for her locker and took out a flick knife.

He took out a flick knife and began to clean his nails.

The defendant had a flick knife displayed in his shop window with a price tag on it.

Statute made it a criminal offence to 'offer' such flick knives for sale.

He held the gate with one hand and drew a flick knife from his back pocket with the other.

Madeleine sniffed loudly again, and made her flick knife disappear.