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Definition of flatten
1make or become flat or flatter: [with object]:spoon the mixture into the pan, flatten into cakes, and fry until brown [no object]:the ground flattened out and became marshy (as adjective flattened)they were dancing on the flattened grass [with object] press (oneself or one’s body) against a surface, typically to get away from something or to let someone pass:they flattened themselves on the pavement as a bomb came whistling down [with object] Music lower (a note) in pitch by a half step. 2 [with object] raze (a building or settlement) to the ground:the hurricane flattened thousands of homes informal knock someone down with power and vigor:once I’m in the ring, I know I can flatten him informal defeat (someone) completely, especially in a sports contest.
1(of an increasing quantity or rate) show a less marked rise; slow down. 2make an aircraft fly horizontally after a dive or climb:he flattened out and made a fine three-point landing