lengthen - definition and synonyms

verb [intransitive/transitive] 

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/ˈleŋθ(ə)n/
present tense
I/you/we/theylengthen
he/she/itlengthens
present participlelengthening
past tenselengthened
past participlelengthened
  1. to become longer, or to make something longer

    The shadows slowly began to lengthen.

    We’re going to lengthen our stay next year.