To unfasten by untying or by releasing from a fixed position; to unfix. Also in figurative context.

transitive. To undo or unfasten (a gate, door, window, etc.); to unlock. Also figurative and in figurative contexts. Also intransitive.

transitive. To unbar (a door, etc.); to open.

transitive. To undo, unfasten, open. Also figurative.

transitive. To withdraw the pin or bolt of (a door, gate, etc.); to unbolt. Also intransitive. Now rare.

transitive. To open or unlock (a door, etc.); †to undo (a lock). Now rare.

To unlock or unpack (a chest, etc.); to unpack (goods). Also with forth, out; occasionally absol. Chiefly Scottish.

transitive. To remove the bar from (a door or gate, etc.); to unfasten, undo. Also absol.

transitive. To undo or unfasten the lock on (a door, window, chest, etc.), typically by turning a key; to open (a door, etc.) by this means. Also…

transitive. To disengage the bolt of (a lock) so as to permit the thing that it secures to become open; to undo, unfasten. Also intransitive: (of a…

transitive. To draw back the bolt of, to unfasten (a door, etc.).

transitive. To undo the latch or catch of (a door, window, etc.); to release or unfasten (anything held by means of a latch or similar fastening…

transitive. To unlock the padlock of (a door, etc.); to free by unlocking a padlock. Also figurative.

transitive and intransitive. To unlatch.

(un-, prefix2 affix 1a + dub, v.3 2.)

transitive. To unfasten (a door).

transitive. To unfasten (a catch); to unlatch.

To turn on, off, out, up, to push open, with a clicking noise.