Weaken

来自Big Physics
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wiktionary

ref 

weak +‎  -en


etymonline

ref

weaken (v.)

late 14c., "to become feeble," from weak + -en (1). Transitive sense from 1560s. Related: Weakened; weakening.

取自“https://www.bigphysics.org/index.php?title=Weaken&oldid=23134”