To sweeten something, either literally by adding sweetness, or figuratively by making something more pleasant or acceptable.
From Latin 'edulcoratus,' past participle of 'edulcorare' (e- 'out' + dulcis 'sweet' + -are verb suffix). It literally means to make sweet or free from bitterness.
Edulcorate is a fancy word for what every parent does—they edulcorate bad news so kids can handle it better!
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