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flat‧ten

1 also flatten out [intransitive and transitive] to make something flat or flatter, or to become flat or flatter :
Use a rolling pin to flatten the dough.
The land flattened out as we neared the coast.
Use a rolling pin to flatten the dough.
The land flattened out as we neared the coast.2 [transitive] to destroy a building or town by knocking it down, bombing it etc [= level]:
Hundreds of homes were flattened by the tornado.
Hundreds of homes were flattened by the tornado.3 to press your body against something :
I flattened myself against the wall.
flatten yourself against something
I flattened myself against the wall.4 [transitive] informal to defeat someone completely and easily in a game, argument etc :
We flattened them 6-0.
We flattened them 6-0.5 [transitive] informal to hit someone very hard
