flop : Idioms & Phrases
belly flop
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noun a dive in which the abdomen bears the main force of impact with the water
belly flopper; belly whopper; belly whop.
WordNet
belly-flop
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verb dive so that one hits the water with one's belly
WordNet
flip-flop
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noun a decision to reverse an earlier decision
turnaround; change of mind; reversal; turnabout.
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noun a backless sandal held to the foot by a thong between the big toe and the second toe
thong.
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noun an electronic circuit that can assume either of two stable states
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noun a backward somersault
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verb reverse (a direction, attitude, or course of action)
interchange; alternate; flip; switch; tack.
WordNet
fosbury flop
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noun jumping over the bar backwards and head first