From Longman Dictionary of Contemporary Englishbell-bottomsˈbell-ˌbottoms noun [plural] DCCtrousers with legs that get wider from the knee to the bottom SYN flares
Examples from the Corpus
bell-bottoms• Other retro favourites are flares and bell-bottoms, such as all-in-one Barbarella-style pants suits, skimming the body down into gentle flares.• When he did so, I did not simply remember myself in bell-bottoms.• The 1970s: Time of bell-bottoms, disco and Watergate.• Tutivena and her Entourage, until the crisscrossing stripes faded at the knees and the bell-bottoms flapped above my ankles. 