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flatten (v.)

late 14c., "to prostrate oneself," also "to fall flat," from flat (adj.) + -en (1). Transitive meaning "to make flat" is 1620s. Related: Flattened; flattening.

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Definitions of flatten from WordNet

flatten (v.)
make flat or flatter;
flatten a road
flatten your stomach with these exercises
flatten (v.)
become flat or flatter;
The landscape flattened
Synonyms: flatten out
flatten (v.)
lower the pitch of (musical notes);
Synonyms: drop
From wordnet.princeton.edu