From Longman Dictionary of Contemporary English.

A teacher’s pet is a child who everyone thinks is the teacher’s favourite student and is therefore disliked by the other students.

For example:

Susan was definitely a teacher’s pet, always getting extra credit and praise.

Some students compete to be the teacher’s pet, hoping for special attention.

The other students resented her because she was the teacher’s pet.

Jill’s classmates called her a teacher’s pet after she volunteered to supervise the class while the teacher was away.

Being the teacher’s pet will get you nowhere when the midterm

exam rolls around.

Note:

By extension, a teacher’s pet is also a derogatory term for someone who has gained or attempts to gain the favor of an authority figure, typically to obtain preferential treatment.

Jeff is the resident teacher’s pet in the office. He brings

the boss coffee every day.

Tradução:

AI Overview

“Teacher’s pet” em português é geralmente traduzido como

 “o queridinho do professor ou xodó do professor.

A expressão se refere a um aluno que é particularmente favorável aos olhos do professor, possivelmente recebendo mais atenção ou tratamento especial.