mut ‧ ton /ˈmʌtn/ BrE AmE 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