knicker /ˈnɪkə(ɹ)/ noun3 •[before a noun] Of or relating to knickers.A knicker nicker nicked a pair of knickers off the clothesline. •knickerbockersCountry club men had reinstated the knicker, adding four inches in length […] — 1983 •(dialect, old-fashioned) A kind of marble used in games, originally made of clay, baked hard and oiled. formsknickers