squirm (v.)youdaoicibaDictYouDict[squirm 词源字典]
1690s, originally referring to eels, of unknown origin; sometimes associated with worm or swarm, but perhaps imitative. Figurative sense "to be painfully affected, to writhe inside" is from 1804. Related: Squirmed; squirming. As a noun from 1839.[squirm etymology, squirm origin, 英语词源]