(transitive) to barricade with bars / (transitive, figuratively) to prohibit (e.g. a topic of discussion)

A thermal lance.

(computing, graphical user interface) An information area typically found at the bottom of windows in a graphical user interface.

(gymnastics) A horizontal bar. / (figuratively) A high standard.

A short bar put through the hole in a socket spanner or box spanner to provide leverage.

Spoken form of ℏ, reduced Planck's constant.

(US) A bar at a social event where guests are required to pay for the drinks themselves.

(US, of a bar or restaurant) Serving hard liquor, instead of only beer and wine.

An anti-sway bar.

(grammar, X-bar theory) A phrase, or, equivalently, a node in a syntax tree, which consists either of: (1) an adjunct and another X-bar phrase, (2) a head, X, and an optional complement, or (3) a conjunction sandwiched between two other X-bars. The X is a "pro-letter" which can be substituted by letters such as N for noun, V for verb, P for preposition, I for inflectional, etc.