ETYM Old Eng. crampe, craumpe; akin to Dutch and Swed. kramp, Dan. krampe, German krampf (whence French crampe), Icel. krappr strait, narrow, and to Eng. crimp, crumple; cf. cram. Related to Grape.
Painful contraction of one or more muscles. It may be due to fatigue, stress or poor posture, or, more rarely, to an imbalance of salts.
1. A clamp for holding pieces of wood together while they are glued.
2. A strip of metal with ends bent at right angles; used to hold masonry together; SYN. cramp iron.

To secure with a cramp.

1. Hard to understand or figure out
2. Being cramped