To obstruct the passage of (someone or something).

“Our way was barred by a huge rockfall.”

To prohibit.

“I couldn't get into the nightclub because I had been barred.”

To lock or bolt with a bar.

“bar the door”

(collective) Bars; an arrangement or pattern of stripes or bars.

The act of fitting or closing something with bars.

The exclusion of someone; blackballing.

Unless something happens; excepting; in the absence of.

“Barring any further red tape, we will finally be able to open the restaurant.”