once crooks talked back to curlys wife what did she say to him that made him literly cower in to a corner

She says she just has to accuse him of something with sexual connotations and he will get lynched.

from the text;

“Listen, Nigger,” she said. “You know what I can do to you if you open your trap?”

and there's one more line;

“Well, you keep your place then, Nigger. I could get you strung upon a tree so easy it ain’t even funny.”