Tried to cut his throat with a gravity knife.

Toward the rear of the counter a kid was demonstrating a gravity knife to a couple of his friends.

The slim man had put away the gravity knife.

He looked down to see the stiletto blade of a gravity knife pressed against her side.

His arms opened wide and he dropped the gravity knife into the water.

It seemed important now to retrieve Antonio's gravity knife.

As a result, they jumped armed only with a holstered pistol and a small "gravity knife".

A gravity knife relies on a latch to hold the folding blade in an open position once released.

The illustration shows the internal parts of a 1960s Japan import 'false' gravity knife.

Local jurisdictions including cities and counties may also restrict the ownership or carrying of gravity knives.