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

 

shorten

 verb
verb
BrE BrE//ˈʃɔːtn//
 
; NAmE NAmE//ˈʃɔːrtn//
 
[transitive, intransitive]Verb Forms present simple I / you / we / they shorten
BrE BrE//ˈʃɔːtn//
 
; NAmE NAmE//ˈʃɔːrtn//
 
he / she / it shortens
BrE BrE//ˈʃɔːtnz//
 
; NAmE NAmE//ˈʃɔːrtnz//
 
past simple shortened
BrE BrE//ˈʃɔːtnd//
 
; NAmE NAmE//ˈʃɔːrtnd//
 
past participle shortened
BrE BrE//ˈʃɔːtnd//
 
; NAmE NAmE//ˈʃɔːrtnd//
 
-ing form shortening
BrE BrE//ˈʃɔːtnɪŋ//
 
; NAmE NAmE//ˈʃɔːrtnɪŋ//
 
 
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to make something shorter; to become shorter shorten (something) Injury problems could shorten his career. a shortened version of the game In November the temperatures drop and the days shorten. shorten something to something Her name's Katherine, generally shortened to Kay. opposite lengthenExtra examples The course has now been shortened considerably. The waiting time has been shortened dramatically from eight weeks to just one week. In November the temperature drops and the days shorten. Katherine generally shortens her name to Kay. The distance between the cars shortened. They performed a shortened version of the play in just 40 minutes. They say that each cigarette you smoke shortens your life by five minutes.
See the Oxford Advanced American Dictionary entry: shorten