free from difficulties or obstructions

even and uninterrupted in movement or flow

a smooth ride

not sharp or acid

a smooth sherry

to make or become (something) smooth

(often + out) to press (something) flat

(often + down) to cause (e.g. hair) (something) to lie evenly and in order

He smoothed down his hair

(often + away/over) to dispel or alleviate (e.g. enmity or perplexity)

to free (something) from obstruction or difficulty

smooth the way

to free (something) from what is harsh or disagreeable

to become smooth

a smooth or agreeable side or aspect

take the rough with the smooth

the act or an instance of smoothing