know better

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know better

To be aware or capable of better or smarter behavior than one has demonstrated. You know better than to talk to strangers! What were you thinking? You know better than to try to question that professor—he doesn't care what we have to say.
See also: better, know
Farlex Dictionary of Idioms. © 2022 Farlex, Inc, all rights reserved.

know better (than to do something)

to be wise enough, experienced enough, or well trained enough not to have done something wrong. Mary should have known better than to accept a lift from a stranger. Children should know better than to play in the road.
See also: better, know
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.

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]
See also: better, know
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

know better than

be wise, well-informed, or well-mannered enough to avoid doing something specified.
1989 Anne Fine Goggle-Eyes Inspector McGee knows better than to tangle with Beth's granny.
See also: better, know
Farlex Partner Idioms Dictionary © Farlex 2017

know ˈbetter (than that/than to do something)

be sensible enough not to do something: You left the car unlocked? I thought you’d know better.He knows better than to judge by appearances.
See also: better, know
Farlex Partner Idioms Dictionary © Farlex 2017
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References in periodicals archive ?
Local economic development understood the concept of place-based policies, which is basically about the creation of policies starting with the assumption that people know better and that successful policies require engaged societies which participate in the development of their own priorities and policies.
(See the thing is, what you never recognized when you scolded yourself for knowing better is that you didn't in fact know better. Get it?
However, most of those who have gone through the painful and stressful experience of having their license in jeopardy now KNOW better and they will do whatever it takes to make sure they DO better.
That image, thank goodness, is a long way behind us in the region itself - we know better now, after all - but it lingers in the psyche as a stereotypical image of our city in many areas south of Knutsford Services.
Indeed, I do know better than your original correspondent because I knew that responding to such verbal aggression would gain nothing.
I've fancied Brian Reid's men from the off but should know better than writing off my old gaffer Michael O'Neill.
"As for Amanda Staveley, she should know better than to publicly put words in my mouth - particularly words she knows or should know perfectly well aren't true.
You know better than to think we could get the Stephenses to explain their business deals, and you also know better than to think they would jump out of a long-term investment at the bottom of the market.
It's Not Enough to Know Better, Video, 2004, Vivid Edge Productions, $795.
We know better today unless, God forbid, you should be a Latino or Arab immigrant.
Alan King's mare is highly regarded, but this was not the first time she has been done for a turn of foot close home and her 1.05 backers will know better next time.
In response to lawsuits against tobacco companies, Parrotta blamed consumers who plead ignorance in such cases, but who should know better: "These people suing the tobacco companies today.
Think of a guy in your school you'd like to know better. Say "hi" to him tomorrow and, soon, you may be thinking about him instead of a boy who is taken.
Recyclers engaged in international trade know better.
Regardless, Beauford creates characters readers will want to know better.
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