'Under-arm' definitions:

Definition of 'Under-arm'

From: GCIDE
  • Under-arm \Un"der-arm\, a. (Cricket)
  • 1. 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. [1913 Webster]
  • 2. For use under the arms, specifically in the armpit; as, an underarm deodorant. [PJC]