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English definition of “lengthen”

lengthen

verb [I or T] uk   /ˈleŋ.θən/ us  
C1 to make something longer, or to become longer: I'll have to lengthen this skirt. lengthening waiting lists If you lengthen something, or it lengthens, it takes longer to happen: There is a plan to lengthen the three-year course to four years.
Opposite
(Definition of lengthen from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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