jackknife

30Mar07

n.

1. A large clasp knife.
2. Sports. A dive in the pike position, in which the diver straightens out to enter the water hands first.

v., -knifed, -knif·ing, -knifes.

v.tr.

1. To fold or double (something or oneself) like a jackknife.
2. To cut or stab with a jackknife.

v.intr.

1. To bend or fold up like a jackknife: A truck that had jackknifed was blocking the road.
2. To form a 90° angle.



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