Definition of flip-flopper noun from the Oxford Advanced Learner's Dictionary

 

flip-flopper

 noun
noun
BrE BrE//ˈflɪp flɒpə(r)//
 
; NAmE NAmE//ˈflɪp flɑːpər//
 
(informal, especially North American English)
 
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a person, especially a politician, who suddenly changes his or her opinion or policy He described his opponent as a flip-flopper. Voters may not worry about consistency and may actually prefer a flip-flopper. see also U-turn
See the Oxford Advanced American Dictionary entry: flip-flopper