To fasten or secure with a bar; to block or obstruct with bars.
From 'be-' (to cause or cover) plus 'bar' (a rod or barrier). The 'be-' prefix transforms the noun 'bar' into a verb meaning to apply or use bars as a tool.
This word captures a specific action—not just having a bar, but actively using one to secure something—which is why old texts about fortifications and prisons specifically chose this word over simpler alternatives.
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