Informal. a sudden or unexpected reversal, as of direction, belief, attitude, or policy.
a backward somersault.
Also called flip-flop circuit. Electronics. an electronic circuit having two stable conditions, each one corresponding to one of two alternative input signals.
any of several similar devices having two alternative states, the change of state being caused by some input signal or by some change of input.
the sound and motion of something flapping, as a wind-blown shutter; a banging to and fro.
any backless, usually open-toed flat shoe or slipper.
a flat, backless rubber sandal, usually secured on the foot by a thong between the first two toes, as for use at a beach, swimming pool, etc. Compare thong, zori.
(in advertising) a display or presentation, usually on an easel, consisting of a series of pages hinged at the top and flipped over in sequence.
with repeated sounds and motions, as of something flapping.
verb (used without object), flip-flopped, flip-flopping.
Informal. to make a sudden or unexpected reversal, as of direction, belief, attitude, or policy: The opposition claimed that the president had flip-flopped on certain issues.
to execute a backward somersault.
to flap; bang to and fro: The door flip-flopped in the high wind.
Also, flip-flap [flip-flap] , (for defs 2, 5, 9, 12), flipflop (for defs 6, 7).


Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
1.  a backward handspring
2.  Also called: bistable an electronic device or circuit that can assume either of two stable states by the application of a suitable pulse
3.  informal chiefly (US) a complete change of opinion, policy, etc
4.  a repeated flapping or banging noise
5.  Also called (US, Canadian, Austral, and NZ): thong a rubber-soled sandal attached to the foot by a thong between the big toe and the next toe
vb , -flops, -flopping, -flopped
6.  informal chiefly (US) to make a complete change of opinion, policy, etc
7.  to move with repeated flaps
8.  with repeated flappings: to go flip-flop
[C16: reduplication of flip]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

also flip flop, "thong sandal," by 1972, imitative of the sound of walking in them (flip-flap had been used in various echoic senses since 1520s); sense of "complete reversal of direction" dates from 1900.
Online Etymology Dictionary, © 2010 Douglas Harper
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Computing Dictionary

flip-flop definition

A digital logic circuit that can be in one of two states which it switches (or "toggles") between under control of its inputs. It can thus be considered as a one bit memory. Three types of flip-flop are common: the SR flip-flop, the JK flip-flop and the D-type flip-flop (or latch).
Early literature refers to the "Eccles-Jordan circuit" and the "Eccles-Jordan binary counter", using two vacuum tubes as the active (amplifying) elements for each bit of information storage. Later implementations using bipolar transistors could operate at up to 20 million state transitions per second as early as 1963.
The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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Example sentences
The flip-flop charge, however, is likely to continue.
Get a grip on warm poolside fun with this stable, practical and highly
  fashionable flip-flop.
The latest flip-flop has divided the president's critics.
The number and distribution of big hurricanes seems to flip-flop between two
  fairly stable patterns.
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