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]
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- know a thing or two,
- know all the answers,
- know beans,
- know by heart,
- know by sight,
- know enough to come in out of the rain,
- know from adam,
- know if one is coming or going
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.