Sidearm has 5 different meanings across 2 categories:
Adjective · Adverb
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.
(of pitches) made with the arm moving parallel to the ground
"a sidearm pitch"
in a sidearm manner
"he prefers to throw sidearm"
With one's arm roughly parallel to the ground.