I. ˈ ̷ ̷ˌ ̷ ̷ adjective
Etymology: side (I) + arm
1. : of, relating to, or constituting a style of pitching or throwing (as in baseball) in which the arm is not raised above the shoulder and the ball is delivered with a sideways sweep of the arm across the body between the shoulder and the hip
sidearm delivery
2. : of, relating to, or constituting a device with outlet on the side (as a gas-fired heater for connection to a water tank)
II. adverb
: in a sidearm manner or style : with a sidearm delivery
he pitched sidearm