補習

1. Origins, structure, and basic meaning

• Structure: 補習 (ほしゅう) is a noun for an additional lesson that makes up missed or insufficient regular instruction.
• Basic usage: 放課後の補習を行う describes an extra lesson for absent students, while 数学の補習で質問する marks the lesson in which unclear problems are asked about.

2. Common pitfalls and similar expressions

• Make-up class and subject support
  • 補習を行う has an instructor provide a lesson, whereas 補習で質問する has a student learn within it. The term is not detention as punishment.