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English definition of “flatten”

flatten

verb [I or T] (MAKE THINNER)    /ˈflæt.ən/ US  /ˈflæt̬-/
C2 to become level and thinner or to cause something to become level and thinner : Flatten the pastry into a thin disc with your hands . The biscuits will flatten out as they cook .Making things more or less smooth or straight
(Definition of flatten verb (MAKE THINNER) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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