Gran Diccionario Oxford (español inglés inglés-español)
Estructura completa
to be a mutton dressed as lamb
Contexto
The little group clustered together with Karen at the center, rather like a herd of plains creatures protecting their young from wolf attack. Except, of course, that she was no longer young, she thought wryly. Maybe it's more like the way priests prepared the sacrificial lamb. But at my age I'm mutton dressed as lamb, she told herself, and looked down at her outfit to be sure it wasn't too young for her.