Antonyms of verb flatten

1 of 3 senses of flatten

Sense 3
flatten, drop -- (lower the pitch of (musical notes))
       Antonym of sharpen (Sense 6)
      => sharpen -- (raise the pitch of (musical notes))

Synonyms/Hypernyms (Ordered by Estimated Frequency) of verb flatten

3 senses of flatten

Sense 1
flatten -- (make flat or flatter; "flatten a road"; "flatten your stomach with these exercises")
       => shape, form -- (give shape or form to; "shape the dough"; "form the young child's character")

Sense 2
flatten, flatten out -- (become flat or flatter; "The landscape flattened")
       => change shape, change form, deform -- (assume a different shape or form)

Sense 3
flatten, drop -- (lower the pitch of (musical notes))
       => change, alter, modify -- (cause to change; make different; cause a transformation; "The advent of the automobile may have altered the growth pattern of the city"; "The discussion has changed my thinking about the issue")