mut‧ton /ˈmʌtn/ noun
[Date: 1200-1300; Language: Old French; Origin: moton '(male) sheep']

1. [uncountable] the meat from a sheep ⇒ lamb

2. mutton dressed as lamb British English used to describe, in a disapproving way, someone who is wearing clothes that are usually worn by younger people

[TahlilGaran] Dictionary of Contemporary English ▲