Definition of lengthen verb from the Oxford Advanced American Dictionary

 

lengthen

 verb
verb
NAmE//ˈlɛŋkθən//
 
, NAmE//ˈlɛŋθən//
 
[intransitive, transitive]Verb Forms present simple I / you / we / they lengthen
 
he / she / it lengthens
 
past simple lengthened
 
-ing form lengthening
 
 
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to become longer; to make something longer The afternoon shadows lengthened. lengthen something I need to lengthen this skirt. opposite shortenWord Familylong adjective adverblength nounlengthy adjectivelengthen verb
See the Oxford Advanced Learner's Dictionary entry: lengthen