knee-high /ˌniːˈhaɪ/adjective 1noun 2forms 2 adjective1 •(figurative) Very young.John Fred Gourrier had been listening to Fats Domino, Smiley Lewis, and the Spiders since he was knee-high. — 1990 noun2 •[in the plural] a sock that reaches almost up to the knee •[usually plural] A sock or stocking that reaches to just below the knees. formsknee highs · knee-highs
