One of the mysteries of the English language finally explained.
1A piece of armour to protect the arm. Now historical.
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.
Mid 17th century; earliest use found in Charles Hoole (1610–1667), schoolmaster and author. From arm + piece.
arm piece/ˈɑːm piːs/
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