Meaning of “know full well” in the English Dictionary

american-english dictionary

"know full well" in American English

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know full well

also understand/realize full well

to know something without a doubt:

You know full well that you’re not supposed to take the car without asking me!
Note: Used in a situation where someone knows something but does not act according to what they know.

(Definition of “know full well” from the Cambridge Academic Content Dictionary © Cambridge University Press)