droop
v.
early 13c., from Old Norse drupa "to drop, sink, hang (the head)," from Proto-Germanic *drup-, from PIE *dhreu-, related to Old English dropian "to drop" (see drip). Related: Drooped; drooping. As a noun, from 1640s.
| 词汇 | droop | 
| 词根词缀 | Online Etymology Dictionary droop v. early 13c., from Old Norse drupa "to drop, sink, hang (the head)," from Proto-Germanic *drup-, from PIE *dhreu-, related to Old English dropian "to drop" (see drip). Related: Drooped; drooping. As a noun, from 1640s. | 
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