拖堂

tuōtáng
  1. to drag out a lesson
  2. to insist on extending class after the bell

CEDICT

to have a lesson run overtime; to extend class time

Wiktionary

拖长课堂时间规定下课时间依然持续授课

維基詞典

Examples

拖堂情况对于学生们而言十分常见。

Having their classroom time extended is a very common occurrence for students.

Source: Tatoeba

Entry Composition