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English definition of “flatten”

flatten

verb [I or T] uk   /ˈflæt.ən/ us    /ˈflæt̬-/

flatten verb [I or T] (BECOME LEVEL)

C2 to become level or cause something to become level: Several trees were flattened (= knocked down) by the storm. The path flattens (out) (= does not go up so much) as it reaches the top of the hill.Making things more or less smooth or straight

flatten verb [I or T] (MAKE THINNER)

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 from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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