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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-nice, OK? We'll make nice-nice with police as soon as they stop targeting our community for no good reason.
See also: make
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.