课 (traditional 課) pairs speech 讠 with 果 (fruit, also the sound): originally to examine and assess — talk that must produce results. Assessment became curriculum: the lesson.
课 schedules student life: 上课 (class begins — also 'attend class'), 下课 (class dismissed — the two most emotionally opposite phrases in any school), 课本 (textbook), 功课 (homework). China's after-school 补课 (supplementary classes) culture is legendary. This app is your daily 汉字课 — one lesson, one character, speech bearing fruit.
Speech 讠 that must bear fruit 果 — the LESSON.
下课! (class dismissed) doubles as sports slang for firing a coach — the ultimate 'school's out'.