What's the difference between unbar and upbar?

Unbar

Definition:

• (v. t.) To remove a bar or bars from; to unbolt; to open; as, to unbar a gate.

Example Sentences:

• (1) "All gates to victory have now been unbarred; there is now just a tiny latch left to be unlocked," he said.

Upbar

Definition:

• (v. t.) To fasten with a bar.
• (v. t.) To remove the bar or bards of, as a gate; to under.

Example Sentences: