a snake (in the grass)
US /ə sneɪk ɪn ðə ɡræs/
UK /ə sneɪk ɪn ðə ɡræs/
1.
阴险小人, 两面派
a treacherous or deceitful person, especially one who feigns friendship
:
•
I thought he was my friend, but he turned out to be a snake in the grass.
我以为他是我的朋友，但他却是个阴险小人。
•
Be careful of him; he's known to be a snake in the grass.
小心他；他是个出了名的阴险小人。