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flatten

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flatten/ˈflætn̩/verb
flattensflattenedflattening
flatten
/ˈflætn̩/
verb
flattensflattenedflattening
Learner's definition of FLATTEN  
[+ object]  : to make (something) flat or flatter
   b  [no object]  : to become flat or flatter
[+ object] 
: to knock down (something or someone)
   b  informal  : to defeat (a competitor) easily or completely
[no object]  : to go to and stay at a lower level — often + out
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