Entry 2 senses · 2 variants Webster, 1913 Unbolt /ŭn'-bōltˌ/ · Un·bolt · IPA /ˈʌnbˌoʊlt/ v. t. v. i. 01 v. t. To remove a bolt from; to unfasten; to unbar; to open. 1. To remove a bolt from; to unfasten; to unbar; to open. 02 v. i. To explain or unfold a matter; to make a revelation. 1. To explain or unfold a matter; to make a revelation.[Obs.]