noun
extracurricular lesson; out-of-class lesson
Refers to a lesson or class conducted outside the regular curriculum, often as a special activity, field trip, or supplementary session.
今日の課外授業で博物館に行きます。
We're going to the museum for today's extracurricular lesson.
課外授業として、地
As an extracurricular lesson, we participated in a local cleanup activity.