A person who studies a lot and is very good at school.
Some people think swotters are very smart, but others might think they are boring.
Examples:
The swotter always gets the best grades.
She is a swotter because she studies every day.
The swotter knows all the answers in class.
The swotter never forgets to do their homework.
The swotter is like a walking dictionary.
The swotter is the teacher's favorite student.