unbolt

From Wiktionary

Word parts[change]

un- + bolt

Pronunciation[change]

Verb[change]

Plain form
unbolt

Third-person singular
unbolts

Past tense
unbolted

Past participle
unbolted

Present participle
unbolting

An unbolted door.
  1. (transitive) If you unbolt a door or window, you unlock it by sliding the bolt(s) free.