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know better

Idioms

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]

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

See Examples For:

know better

But if anyone should know better, it’s really Algeria.

From The Wall Street Journal ● Jun. 24, 2026

For moments, it’s our own tertulia, though I know better than to question the bullfight.

From Salon ● Jun. 23, 2026

No one rings a bell at the top, and seasoned traders know better than to try to pick the exact peak.

From Barron's ● Jun. 11, 2026

They know better than anyone that waiting for justice is a frustrating experience.

From BBC ● Jun. 3, 2026

With my eyes still closed, I cross the room I know better than my own and drop down into the old La-Z-Boy that belonged to my dad.

From "Odd One Out" by Nic Stone

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023