Definitions:
a long rigid piece of wood, metal, or similar material, typically used as an obstruction, fastening, or weapon

a counter in a pub, restaurant, or cafe across which drinks or refreshments are served

a barrier or restriction to an action or advance

any of the short sections or measures, typically of equal time value, into which a piece of music is divided, shown on a score by vertical lines across the stave

a partition in a court room, now usually notional, beyond which most people may not pass and at which an accused person stands

the profession of barrister

fasten (something, especially a door or window) with a bar or bars

prevent or prohibit (someone) from doing something or from going somewhere

mark (something) with bars or stripes

except for

a unit of pressure equivalent to a hundred thousand newtons per square metre or approximately one atmosphere.