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Supposedly vs. Supposably

know better

Be able to recognize something as wrong or not possible, as in Mary should know better than to leave her child alone in the house, or Try to get in without a ticket? You know better than that. [ c. 1700 ]
The American Heritage® Idioms Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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  • "Now, you know better than that, Harran," remonstrated S. Behrman blandly.

    The Octopus Frank Norris
  • I am myself, although, as a student of philology, I ought to know better.

    The Romance of Names Ernest Weekley
  • It was strong enough to show her on what points other people were likely to know better than she did.

    That Unfortunate Marriage, Vol. 1(of 3) Frances Eleanor Trollope
  • They daren't take her back to any of their own places; they know better.

    The Tinted Venus F. Anstey
  • Upon this the eldest son said, “I will watch the tree to-night, and will teach the rogue to know better!”

    The Russian Grandmother's Wonder Tales Louise Seymour Houghton

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