(of trousers) having legs that flare at the bottom(adjective)
WordNet. Princeton University. 2010.
Use "bellbottom" in a sentence
"The ex-lawmaker was known in Congress for his distinctive toupee, wild hairstyle, bellbottom pants and one-minute floor speeches punctuated with the Star Trek catch phrase, "Beam me up.""
"How else do you explain the fact that you are able to both continually crane your neck to look through pub windows and dance a sailor's hornpipe at the drop of a pair of bellbottom trousers?"
"Or maybe it was on the Ed Sullivan Show, where a sunflower-Afro and bellbottom-jean-wearing Michael led The Jackson 5 through the paces of I Want You Back."