know something full/perfectly/very well

know full well

To know or be aware of something without any possible doubt. You know full well why I'm upset with you, so there's no use playing dumb! We know full well that many families are struggling to make ends meet, but these tax increases are unavoidable.
See also: full, know, well
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

know something ˌfull/ˌperfectly/ˌvery ˈwell

used when you wish to indicate that the person you are speaking to already knows something you have just said or are about to say: You know full well that smoking is forbidden in this room.You know perfectly well what I am referring to.
See also: full, know, something, very, well
Farlex Partner Idioms Dictionary © Farlex 2017
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