A@Sternumhigh-PalmDown-A@Sternumhigh-PalmDown A@Chesthigh-PalmDown-A@Chesthigh-PalmDown

Etymology
From initial letter of, using a movement similar to the ASL sign.

Production

 * Move the hands downward firmly a short distance.
 * Variations may double this movement.
 * Move the hands downward firmly a short distance.
 * Variations may double this movement.

Adjective

 * 1) able