- soften (v.)
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[soften 词源字典] - late 14c., "to mitigate, diminish" (transitive), from soft (adj.) + -en (1). Meaning "to make physically soft" is from 1520s; intransitive sense of "to become softer" is attested from 1610s. Soften up in military sense of "weaken defenses" is from 1940. Related: Softened; softening.[soften etymology, soften origin, 英语词源]