1 (in pl.) loose-fitting breeches gathered at the knee or calf.
2 (Knickerbocker) a a New Yorker. b a descendant of the original Dutch settlers in New York.
Knickerbocker Glory ice-cream served with other ingredients in a tall glass.
Diedrich Knickerbocker, pretended author of W. Irving's History of New York (1809)