Definition of "unbolt"

unbolt

verb
third-person singular simple present unbolts, present participle unbolting, simple past and past participle unbolted
1. (transitive) To unlock by undoing the bolts of.
  Quotations
  Then, sweet my lord, I’ll call mine uncle down;He shall unbolt the gates.
  c. 1602, William Shakespeare, “The Tragedie of Troylus and Cressida”, in Mr. William Shakespeares Comedies, Histories, & Tragedies […] (First Folio), London: […] Isaac Iaggard, and Ed[ward] Blount, published 1623, [Act IV, scene ii]