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flatten

verb
     
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.
2 [transitive] to destroy a building or town by knocking it down, bombing it etc [= level]:
Hundreds of homes were flattened by the tornado.
3

flatten yourself against something

to press your body 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.
5 [transitive] informal to hit someone very hard

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