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Phrase(s): sweeten someone up
to make someone more pleasant. • I had hoped that a week in the Caribbean would sweeten him up. • The trip sweetened him up, but not for long., Phrase(s): sweeten something up
to make something taste sweeter. • Where is the sugar? I need to sweeten this up a little. • A little sugar will sweeten up the coffee.
McGrawhill's American Idioms And Phrasal Verbs