cheapen
/ˈtʃi:pən; `tʃipən/ v
1 [Tn] (cause sth to) become cheap or cheaper 减价
cheapen the cost of sth 降低某事物的价钱.
2 [Tn] make (oneself/sth) less worthy of respect; degrade 降低（自己[某事物]）的身价; 贬低
It's only cheapening yourself to behave like that. 那样做只能使你自贬身价.