Flatten
Flatten verb - To make free from breaks, curves, or bumps.
Straighten is a synonym for flatten in smooth topic. In some cases you can use "Straighten" instead a verb "Flatten", when it comes to topics like level out.
Straighten
Straighten verb - To cause to follow a line that is without bends or curls.
Flatten is a synonym for straighten in smooth topic. You can use "Flatten" instead a verb "Straighten".
Nearby Words: straight, straightening
Common collocations
Cite this Source
Straighten and Flatten. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/flatten/straighten
Flatten & Straighten. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/flatten/straighten>.
Straighten or Flatten. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/flatten/straighten.
Google Ngram Viewer shows how "flatten" and "straighten" have occurred on timeline