Definition of "under-arm" [un•der-arm]

• Done (as bowling) with the arm not raised above the elbow, that is, not swung far out from the body; underhand. Cf. over-arm and round-arm. (adjective)
• For use under the arms, specifically in the armpit. (adjective)

Gnu Collaboartive International Dictionary of English: licensed under The Code Project Open License (CPOL)

• "Sarah Palin has as much intelligence as a sack of her under-arm hair."
• "He began to swear at the umpire and the crowd, especially after losing a key point in the fifth set when Chang shocked him by delivering an under-arm serve."
• "Also, if the swordsman advances, then the under-arm spear user can retreat a great deal faster, to bring his spearhead between them, as he has the ability denied to the over-arm user, of pulling back his spear, and sliding his right hand up the shaft, to shorten the weapon for close use."