Definition of shorten verb from the Oxford Advanced American Dictionary

 

shorten

 verb
verb
NAmE//ˈʃɔrtn//
 
[transitive, intransitive]Verb Forms present simple I / you / we / they shorten
 
he / she / it shortens
 
past simple shortened
 
-ing form shortening
 
 
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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 lengthen
See the Oxford Advanced Learner's Dictionary entry: shorten