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English definition of “lengthen”

lengthen

verb [I or T]     /ˈleŋ.θən/
C1 to make something longer , or to become longer : I'll have to lengthen this skirt . lengthening waiting lists Enlarging and inflatingBecoming biggerBecoming biggerEnlarging and inflating 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 shortenContinue and last
(Definition of lengthen verb from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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