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) ;

1. (

• planate ,
• flattened

) having been flattened ;