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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
Try to get in without a ticket? You know better than that
The American Heritage® Idioms Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Nothing fairer than peace is given to man to know; Better one peace than countless triumphs.
Know better now. Unknow better now.
... men know best about everything, except what women know better.
Nearby words for know better
know a thing or two
know all the angles
know all the answers
know beans, not
know by heart
know by sight
know enough to come in out of the rain
know from adam
know from nothing
know if one is coming or going
know it all
know like a book
know one's ass from one's elbow
know one's onions
know one's own mind
know one's place
know one's stuff
know one's way around
know only too well
know shit from shinola, not
know someone from adam, not
know something from a hole in the ground
know something inside out
know something like the back of one's hand
know the ropes
know the score
know the time of day