sideline

SIDELINE noun

[ C ] uk/ˈsaɪdlaɪn/ us
a job or business in addition to your main job or business

побочная работа
He works in a bank but teaches English as a sideline .
sideline verb [ T ] uk/ˈsaɪdlaɪn/ us
to stop someone from being included in an activity that they usually do, especially a sport

выводить из игры
[ often passive ] He's broken his ankle and could be sideline d for weeks.