Definition of judge and jury in US English:

judge and jury

noun

  • A person who or thing which has or claims authority to decide upon a matter without reference to others. Chiefly in predicative use.

verb

rare
  • with object To give consideration to or pass judgement upon as a judge and jury, or in the manner of a judge and jury; to try to pass sentence upon.

Origin

Late 16th century; earliest use found in George Whetstone (d. 1587), writer. From judge + and + jury<br>late 19th century; earliest use found in Thomas Hardy (1840–1928), novelist and poet. From judge and jury.

Pronunciation

judge and jury

/ˌdʒʌdʒ ən(d) ˈdʒʊəri/