Collapse
Collapse verb - To fall down or in as a result of physical pressure.
Usage example: the motel balcony collapsed under the weight of so many people
Flatten and collapse are semantically related in let the air out topic. In some cases you can use "Flatten" instead a verb "Collapse".
Flatten
Flatten verb - To make free from breaks, curves, or bumps.
Collapse and flatten are semantically related in let the air out topic. Sometimes you can use "Collapse" instead a verb "Flatten".
Common collocations
Both words in one sentence
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In the Super Secret Secret Squirrel episode "Quark", a sub-microscopic supervillain named Quark plans to flatten North America by "pulling out the bottom atom" of everything to make it all collapse, to make room for his own amphitheater (Canada) and a parking lot for it (the US).
Source: Puff of Logic
Cite this Source
Flatten and Collapse. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/collapse/flatten
Collapse & Flatten. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/collapse/flatten>.
Flatten or Collapse. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/collapse/flatten.
Google Ngram Viewer shows how "collapse" and "flatten" have occurred on timeline