under-arm

from The Collaborative International Dictionary of English v.0.48

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]