The Collaborative International Dictionary
Under-arm
Under-arm \Un"der-arm\, a. (Cricket)
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.
For use under the arms, specifically in the armpit; as, an underarm deodorant.
Usage examples of "under-arm".
They palpated every tube and removed the batteries from the electric shaver which Isabella used on her under-arm hair.