cut someone dead—
1. refuse to recognize a person; pretend not to know smb.:
- She proceeded on her way, her nose at a celebrated elevation—an icy nose. She cut him dead.
2. ignore a person when being talked to (because one is angry, etc.):
- He started talking to her and she cut him dead saying “I don’t want to hear your life history, pal!”
cut someone’s throat—(hyperbolic) cause smb.’s ruin or downfall:
- We’re shorthanded right now, and Genevieve would cut my throat if I tried to send you.