DIP (4)

Dip, n. 1. 1. A gymnastic exercise on the parallel bars in which the performer, resting on his hands, lets his arms bend and his body sink until his chin is level with the bars, and then raises himself by straightening his arms.
2. 2. In the turpentine industry, the viscid exudation, which is dipped out from incisions in the trees; as, virgin dip (the runnings of the first year), yellow dip (the runnings of subsequent years).
3. 3. (Aëronautics) A sudden drop followed by a climb, usually to avoid obstacles or as the result of getting into an airhole.