She tried to 'smooth things out' [=end an argument or disagreement] with her daughter-in-law, but the damage was done.
They 'smoothed the way' for a quick end to the dispute. [=they made it easier to achieve a quick end to the dispute]
Her time at college wasn't all 'smooth sailing'. [=she had some problems/difficulties during her time at college]
(..) I know what makes you a boy. Uh, ooh, you do? Your bald head. Oh, yes. It's really smooth. Sometimes I stare at it, and imagine a little chick popping out. Peep peep peep. Good night, Agnes. Never get older. (..)2013 Despicable Me 2