to make something such as cloth or hair flat by moving your hands across it:
Liz smoothed her skirt and sat down.
smooth something back/down
She smoothed back her hair.
2 also smooth down
to make a rough surface flat and even:
The wood was smoothed and trimmed to size.
Smooth down all the surfaces before you start painting.
3 [always + adverb/preposition]
to rub a liquid, cream etc gently over a surface or into a surface
smooth something into/over something
She smoothed suntan lotion over her legs.
to make it easier for something to happen, by dealing with any problems first:
Staff helped smooth the way for the new administration.
smooth something ↔ awayphrasal verb
A few objections have to be smoothed away before we can start the project.
smooth something ↔ outphrasal verb
to make something such as paper or cloth flat by moving your hands across it:
They smoothed out the map on the table.
Smooth out all the wrinkles.
to make something happen in an even, regular way:
Sometimes central banks intervene to smooth out price fluctuations.
to get rid of problems or difficulties
smooth something ↔ overphrasal verb
Sally managed to smooth over the bad feelings between them.