retract - definition and synonyms

verb [intransitive/transitive] 

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/rɪˈtrækt/
present tense
I/you/we/theyretract
he/she/itretracts
present participleretracting
past tenseretracted
past participleretracted
  1. 2
    if part of an object or animal retracts, or if it is retracted, it is pulled backwards or inside it