make the motions of boxing without landing heavy blows, as a form of training

one contestant broke his nose while sparring

(of a gamecock) fight with the feet or spurs

a period or bout of sparring

a close friend

Buster was his spar and he didn't want to let him down

a thick, strong pole such as is used for a mast or yard on a ship

a crystalline, easily cleavable, translucent or transparent mineral