■ noun
1》 a light sandal with a thong that passes between the big and second toes.
2》 N. Amer. a backward somersault or handspring.
3》 N. Amer. informal an abrupt reversal of policy.
4》 Electronics a switching circuit which works by changing between two stable states.
■ verb
1》 move with a flapping sound or motion.
2》 N. Amer. informal make an abrupt reversal of policy.
Origin
C17: reduplication of flop .