(jib) noun
1. Naut. A triangular sail, set on a stay and extending from the foretopmast head to the jib boom or the bowspirit.
2. The swinging boom of a crane or derrick.
—flying jib A jib set out beyond the standing jib, or an extended boom, called the flying–jib boom.
—the cut of one's jib One's appearance.
—v.t. & v.i. jibbed. jib·bing Naut. To shift or swing; jibe. Also jibb. [? Short for GIBBET]

(jib) v.t. jibbed, jib·bing
1. To move restively sidewise and backward; refuse to go forward, as a horse.
2. To refuse to do something; balk.
—noun A horse that jibs; also jib′ber [Cf. OF giber kick]