Definition from Wiktionary, the free dictionary
Alternative forms 
flip-flop (plural flip-flops)
- A sandal, usually of rubber, secured to the foot by two straps mounted between the big toe and its neighbour.
- An instance of flip-flopping, of repeatedly changing one's stated opinion about a matter.
- (computing, electronics) An electronic circuit (a bistable multivibrator) that has two stable states and is thereby capable of serving as one bit of memory.
repeatedly changing one’s stated opinion
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See also 
- To alternate back and forth between directly opposite opinions, ideas, or decisions.