1. flatten - verb
· make flat or flatter; "flatten a road"; "flatten your stomach with these exercises"
2. flatten - verb
· become flat or flatter; "The landscape flattened"
Synonym(s): flatten_out
Hypernym(s): change_shape, change_form, deform
3. flatten - verb
· lower the pitch of (musical notes)
Synonym(s): drop
Hypernym(s): change, alter, modify
Antonym(s): sharpen
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