mid-14c., flappe "a blow, slap, buffet," probably imitative of the sound of striking. Sense of "device for slapping or striking" is from early 15c. Meaning "something that hangs down" is first recorded 1520s, probably from flap (v.). Sense of "motion or noise like a bird's wing" is 1774; meaning "disturbance, noisy tumult" is 1916, British slang.
flap (v.)
early 14c., "dash about, shake, beat (the wings);" later "strike, hit" (mid-14c.); probably ultimately imitative. Meaning "to swing about loosely" is from 1520s. Related: Flapped; flapping.
权威例句
1. They would flap bath towels from their balconies as they chatted.
他们聊天时会在阳台上抖搂浴巾。
2. Why did people get in a flap over nuclear energy?
为什么人们对核能惶恐不安呢?
3. He drew back the tent flap and strode out into the blizzard.
他拉开帐篷的门帘,大步走进暴风雪中。
4. She folded up her letter, licking the envelope flap with relish.
她把信折好,用力舔了舔信封的折口。
5. Nothing to be heard but the soft flap of a silk banner.