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'm not completely oblivious! - You won't even know I'm here. - Okay. Oh! This is working right... The afternoon is so great! Look at that! So smooth! Stop doing that! Oh my God! Sorry! Sorry, but you see what I mean! You have to be careful. Yeah! I'll be careful! (..)2006 TvShow: The IT Crowd Title: Aunt Irma Visits Season: 1 Episode 6