a wolf in sheep's clothing
US /ə wʊlf ɪn ʃiːps ˈkloʊðɪŋ/
UK /ə wʊlf ɪn ʃiːps ˈkloʊðɪŋ/

1.
um lobo em pele de cordeiro
a person who appears friendly or harmless but is actually dangerous or malicious
:
•
Be careful of him; he's a wolf in sheep's clothing.
Cuidado com ele; ele é um lobo em pele de cordeiro.
•
The new manager seemed nice at first, but he turned out to be a wolf in sheep's clothing.
O novo gerente parecia legal no início, mas ele se revelou um lobo em pele de cordeiro.