not built that way
Not so disposed or inclined, as in I can't apologize for something I didn't do—I'm just not built that way. [Late 1800s]
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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.