/ grɔɪn; NAmE / noun
1.
the part of the body where the legs join at the top including the area around the genitals (= sex organs) :
She kicked her attacker in the groin.
He's been off all season with a groin injury.
—picture at body
2.
( especially NAmE ) = groyne
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WORD ORIGIN
sense 1 late Middle English grynde , perhaps from Old English grynde depression, abyss .