Definition of keister noun from the Oxford Advanced Learner's Dictionary



BrE BrE//ˈkiːstə(r)//
; NAmE NAmE//ˈkiːstər//
(North American English, informal)
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the part of the body that you sit on synonym bottom I’m not going to freeze my keister off out there. Word Originlate 19th cent. (originally referring to a suitcase or box used for carrying possessions or merchandise): of unknown origin.
See the Oxford Advanced American Dictionary entry: keister