Real Dictionary

bayonet
countable noun: A bayonet is a long, sharp blade that can be fixed to the end of a rifle and used as a weapon.
verb: To bayonet someone means to push a bayonet into them.

bayonet in American English
a detachable, daggerlike blade put on the muzzle end of a rifle, for hand-to-hand fighting
to stab, prod, or kill with a bayonet
noun: a daggerlike steel weapon that is attached to or at the muzzle of a gun and used for stabbing or slashing in hand-to-hand combat
transitive verb: to kill or wound with a bayonet

bayonet in British English
noun: a blade that can be attached to the muzzle of a rifle for stabbing in close combat
verb: to stab or kill with a bayonet

bayonet in Mechanical Engineering
noun: A bayonet is a type of fastening in which a cylindrical part is pushed into a socket and turned so that pins on its side fit into grooves in the socket.