n.pl. 1 Brit. a woman's or girl's undergarment covering the body from the waist or hips to the top of the thighs and having leg-holes or separate legs. 2 esp. US a knickerbockers. b a boy's short trousers. 3 (as int.) Brit. sl. an expression of contempt.
[ abbr. of KNICKERBOCKER ]