Definition from Wiktionary, the free dictionary
sidearm (plural sidearms)
- A personal weapon, such as a handgun or sword, carried on the hip in a belt, sheath, holster, etc for rapid access.
- To throw a ball with one's arm roughly parallel to the ground.
2009 March 19, Ben Shpigel, “Medicine’s Loss Could Be the Mets’ Gain”, in New York Times:
- His interest, aside from slinging sinkers as a sidearming right-hander, was medicine.
- With one's arm roughly parallel to the ground.