Definition of prison bar in US English:

prison bar

noun

  • 1Chiefly in plural = prisoners' bars. Now regional.

  • 2A bar used to secure or form a prison cell, door, window, etc. Usually in plural.

Origin

Early 17th century; earliest use found in Robert Parsons (1546–1610), Jesuit. From prison + bar.

Pronunciation

prison bar

/ˌprɪzn ˈbɑː/