1. (verb) flatten
make flat or flatter
Synonyms: drop, flatten out
Antonyms: sharpen
2. (verb) flatten, flatten out
become flat or flatter
Synonyms: flatten, drop, flatten out
Antonyms: sharpen
3. (verb) flatten, drop
lower the pitch of (musical notes)
Synonyms: unload, fell, dribble, send packing, drop off, dismiss, drop down, sink, drip, degenerate, deteriorate, overleap, strike down, leave out, throw, cast, cut down, pretermit, put down, neglect, devolve, expend, send away, set down, flatten, swing, shake off, throw off, throw away, dangle, drop, flatten out, discharge, spend, overlook, knock off, miss, cast off, shed, omit
Antonyms: sharpen
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Synonyms for flatten 
