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Rid of obstructions or difficulties, as in We tried to smooth things over between the families before the wedding but did not succeed . [Late 1600s]
1. To fill or coat something so as to create a smooth surface: The builder smoothed over the seams in the sheetrock with plaster. For a healthy complexion, smooth some cold cream over your face before bed.
2. To make some strained relationship more friendly or amiable: The ambassador smoothed over relations with France. The two players almost got into a fight before the coach smoothed things over between them.