تعریف و معنای "teacher's pet"

What is the origin of the idiom "teacher's pet" and when to use it?

The idiom "teacher's pet" originated in the late 19th or early 20th century and is used to describe a student who is particularly favored by a teacher or seen as the teacher's favorite. The phrase suggests that the student receives special attention, privileges, or preferential treatment from the teacher, potentially due to their exceptional academic performance or exemplary behavior. However, the term is often used in a slightly derogatory manner to imply that the student may be excessively eager to please the teacher and gain advantages, which can lead to resentment from other students.