Antonyms of verb unbolt

1 sense of unbolt

Sense 1
unbolt -- (undo the bolt of; "unbolt the door")
       Antonym of bolt (Sense 2)
      => bolt -- (secure or lock with a bolt; "bolt the door")

Synonyms/Hypernyms (Ordered by Estimated Frequency) of verb unbolt

1 sense of unbolt

Sense 1
unbolt -- (undo the bolt of; "unbolt the door")
       => open, open up -- (cause to open or to become open; "Mary opened the car door")