wouldn't dream of
Also, not dream of. Not occur to one, not consider, as in Even if it were lying open on my desk, I wouldn't dream of reading another person's letter. This expression uses dream of in the sense of “remotely think of.” [First half of 1500s]
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The American Heritage® Idioms Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.