flip-flop

Universal Words noun, verb noun (AmE also thong) a type of SANDAL (= open shoe) that has a strap that goes between the big toe and the toe next to it: a pair of flip-flops verb (-pp-) [V] ~ (on sth) (informal, especially AmE) to change your opinion about sth, especially when you then hold the opposite opinion: The vice-president was accused of flip-flopping on several major issues.