Definitions

1. noun

The area of the body under the arm, especially when referring to armpits or the region below the armpit.

“She applied deodorant to her underarms before going out.”

2. adverb

At or towards the side or beneath the arm.

“He tossed the ball underarm to the player waiting at the edge of the field.”

3. verb

To throw something underarm, typically with the palm facing upwards.

“The quarterback underarmed the pass to his teammate.”