The armpit.
underarm deodorant
Old-fashioned and now outlawed style of bowling in which the arm is not swung over the shoulder.
For use under the arm.
A 1997 study found that about 104 million American women were using underarm deodorant products.
To supply with insufficient weaponry.
From under- + arm. The armpit sense is not old, historically speaking (1920s), and it is believed to have arisen as a euphemism in advertising.
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