Definition of blue jean in English:

blue jean

adjective

  • 1Made of a type of heavy blue twilled cotton cloth, typically used for work clothes (now usually denim). Also figurative: †dull, plain, ordinary (obsolete).

  • 2Characterized by or wearing blue jeans.

noun

  • A heavy blue twilled cotton cloth, typically used for work clothes; blue denim.

Origin

Early 19th century. From blue + jean. Compare slightly earlier blue jeans.

Pronunciation

blue jean

/bluː ˈdʒiːn/