(1):

(n.) An unreasonable notion; a crotchet; a whim; a caprice.

(2):

(n.) A twist or loop in a rope or thread, caused by a spontaneous doubling or winding upon itself; a close loop or curl; a doubling in a cord.

(3):

(n.) A fit of coughing; also, a convulsive fit of laughter.

(4):

(v. i.) To wind into a kink; to knot or twist spontaneously upon itself, as a rope or thread.