how dare you; how could you; how can you have the nerve to
Rhetorical expression of indignation or disbelief, questioning someone's audacity to do something shameful or brazen. Often used when someone shows up or says something after a previous failure or wrongdoing.
After such a failure, how dare you come back?
How can you have the nerve to come asking for money again?
Standard kanji spelling for this fixed expression.
Variant spelling using さげて instead of 下げて; less common but still encountered.
Literally 'with what face lowered', from どの (which) + 面 (face) + 下げて (lowering). The image is of someone so ashamed they should lower their face, yet they appear brazenly; the phrase questions how they can show their face without shame.