Definition of arm piece in English:

arm piece

Pronunciation /ˈɑːm piːs/

noun

  • 1 historical A piece of armour to protect the arm.

  • 2A piece or component for or constituting an arm.

  • 3A physically attractive companion, especially a woman, seen on the arm of a person, typically a male celebrity, at a social event.

Origin

Mid 17th century; earliest use found in Charles Hoole (1610–1667), schoolmaster and author. From arm + piece.