spar

any of various nonmetallic minerals (calcite or feldspar) that are light in color and transparent or translucent and cleavable

a stout rounded pole of wood or metal used to support rigging

making the motions of attack and defense with the fists and arms; a part of training for a boxer

furnish with spars

fight with spurs; "the gamecocks were sparring"

box lightly

fight verbally; "They were sparring all night"