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English definition of “make sth up”

make sth up

(REPLACE) phrasal verb with make     /meɪk/ verb (made, made)
to reduce or replace something, usually an amount of time or work , that has been lost : We're hoping to make up time on the return journey by not stopping at night . You'll have to make up the work you've missed while you were away.Filling and completing
(Definition of make sth up (REPLACE) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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