verb (used with object), unbarred, unbarring.
to remove a bar or bars from; open; unlock; unbolt: to unbar a door.

1300–50; Middle English unbarren. See un-2, bar1

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World English Dictionary
unbar (ʌnˈbɑː)
vb , -bars, -barring, -barred
1.  to take away a bar or bars from
2.  to unfasten bars, locks, etc, from (a door); open

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