abash

To make ashamed; to embarrass; to destroy the self-possession of, as by exciting suddenly a consciousness of guilt, mistake, or inferiority; to disconcert; to discomfit.

He was a man whom no check could abash

The stare seemed to abash Poirot.

To lose self-possession; to become ashamed.

[...] as King Uther lay by his queen, he asked her, by the faith she owed to him, whose was the body; then she sore abashed to give answer.