Definition of "smooth out" [smooth out]

• To make something smooth. (verb)
• To become smooth. (verb)
• To remove irregularities or imperfections. (verb)

Wiktionary.org : Text is available under the Creative Commons Attribution-ShareAlike License

• "In evolution generally, major mutations, even if they cause improvements in generally the right direction, almost always require a lot of subsequent tinkering – a sweeping-up operation by lots of small mutations that come along later and are favoured by selection because they smooth out the rough edges left by the initial large mutation."
• "Modularity was supposed to make evolutionary changes simple—to smooth out a rugged evolutionary landscape."
• "A Barbie-sized waist, and hips that curved just right down into long, lean legs with just enough fat content to smooth out any bones."