spar

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

(noun) a stout rounded pole of wood or metal used to support rigging.

(noun) making the motions of attack and defense with the fists and arms; a part of training for a boxer. Synonyms: sparring.

(verb) furnish with spars.

(verb) fight with spurs. Example: "The gamecocks were sparring."

(verb) box lightly.

(verb) fight verbally. Example: "They were sparring all night."