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To be nice, pleasant, or polite to someone, even if one does not feel inclined to do so. I know you don't care for your cousin, but this is the one time of year we all get the chance to be together, so just make nice, OK? We'll make nice with police as soon as they stop targeting our community for no good reason.
make nice (or nice-nice)be pleasant or polite to someone, typically in a hypocritical way. North American informal
To resolve a quarrel; make up.