A man who betrays a friend abases himself.

叛友者实为自贬身份。

I watched my colleagues abasing themselves before the board of trustees.

我看着同事们在理事会面前卑躬屈膝。

The president is not willing to abase himself before the nation.

总统不愿在全国人民面前降低自己的威信。

He refused to abase himself in the eyes of others.

他不愿在他人面前被贬低。