Meaning of “lengthen” in the English Dictionary

"lengthen" in British English

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lengthenverb [ I or T ]

uk /ˈleŋ.θən/ us /ˈleŋ.θən/

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 Learner’s Dictionary & Thesaurus © Cambridge University Press)

"lengthen" in American English

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lengthenverb [ I/T ]

us /ˈleŋk·θən, ˈleŋ-/

lengthen verb [ I/T ] (DISTANCE)

to make something longer, or to become longer:

[ T ] I’ll have to lengthen this skirt.
[ I ] In the late afternoon, the shadows of the haystacks lengthened.

lengthen verb [ I/T ] (TIME)

to make something take longer to happen, or to become longer:

[ T ] There is a plan to lengthen the summer theater workshop to eight weeks.

(Definition of “lengthen” from the Cambridge Academic Content Dictionary © Cambridge University Press)