"flattened" in the verb sense
1. flatten
make flat or flatter
"flatten a road"
"flatten your stomach with these exercises"
2. flatten, flatten out
become flat or flatter
"The landscape flattened"
3. flatten, drop
lower the pitch of (musical notes)
"flattened" in the adjective sense
1. planate, flattened
having been flattened
Source: WordNet® (An amazing lexical database of English)
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