padlock - definition and synonyms

verb [transitive] 

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/ˈpædˌlɒk/
present tense
I/you/we/theypadlock
he/she/itpadlocks
present participlepadlocking
past tensepadlocked
past participlepadlocked
  1. to fix a padlock to something so it cannot be opened or moved

    He padlocked his bike to the railings.