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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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