Scrabble?! JACKKNIFE

Definitions of JACKKNIFE in various dictionaries:

noun - a large knife with one or more folding blades

noun - a dive in which the diver bends to touch the ankles before straightening out

verb - dive into the water bending the body at the waist at a right angle, like a jackknife

A large clasp knife.

A dive executed by jumping headfirst, bending the body at the waist, and, with the legs straight, touching the feet with the hands before straightening out to enter the water hands first.

To fold or double (something or oneself) like a jackknife.

To cut or stab with a jackknife.

To bend or fold up like a jackknife: A truck that had jackknifed was blocking the road.

To form a 90 angle.