/ ˈʌndərɑːm; NAmE -ɑːrm/ adjective , adverb
■ adjective
1.
[ only before noun ] connected with a person's armpit :
underarm hair / deodorant / sweating
2.
an underarm throw of a ball is done with the hand kept below the level of the shoulder
—compare overarm
■ adverb
if you throw, etc. underarm , you throw keeping your hand below the level of your shoulder
—compare overarm