Definition of lengthen verb from the Oxford Advanced Learner's Dictionary

 

lengthen

 verb
verb
BrE BrE//ˈleŋθən//
 
; NAmE NAmE//ˈleŋθən//
 
[intransitive, transitive]Verb Forms present simple I / you / we / they lengthen
BrE BrE//ˈleŋθən//
 
; NAmE NAmE//ˈleŋθən//
 
he / she / it lengthens
BrE BrE//ˈleŋθənz//
 
; NAmE NAmE//ˈleŋθənz//
 
past simple lengthened
BrE BrE//ˈleŋθənd//
 
; NAmE NAmE//ˈleŋθənd//
 
past participle lengthened
BrE BrE//ˈleŋθənd//
 
; NAmE NAmE//ˈleŋθənd//
 
-ing form lengthening
BrE BrE//ˈleŋθənɪŋ//
 
; NAmE NAmE//ˈleŋθənɪŋ//
 
 
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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 American Dictionary entry: lengthen