false friend

Từ điển Oxford Advanced Learner 8th

ˌfalse ˈfriend BrE NAmE noun
1. a person who seems to be your friend, but who is not loyal and cannot be trusted
2. a word in a foreign language that looks similar to a word in your own language, but has a different meaning
•The English word ‘sensible’ and the French word ‘sensible’ are false friends.

Word Origin:
[false friend] translating French faux ami.