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Explanation: De facto, um dos limpadores começa a oscilar
'Flap off' é mover-se, oscilando. O limpador começa a trabalhar, não a se deter
flapped, flap·ping, flaps.
1. To wave (the arms, for example) up and down.
2. To cause to move or sway with a fluttering or waving motion.
3. To hit with something broad and flat; slap.
4. Informal. To fling down; toss.
1. To move or sway while fixed at one edge or corner; flutter: banners flapping in the breeze.
2. To wave arms or wings up and down.
3. To fly by beating the air with the wings.
4. Informal. To become upset or flustered.