to have the nerve

• 你有脸，这事得你去说。

  You command respect and so you should go and say something about this.

• 当初我曾骂过他，我怎么有脸去见他。

  It was me that first insulted him. How do I have the nerve to see him now?

• 哪有脸见人!

  how dare you show your face in public!

• 他还有脸求人替他隐瞒!

  he even has the gall to ask people to cover up for him!