
Know full well
Feigned Ignorance
Used when someone pretends not to know something they actually do.

You know full well why I was upset, stop pretending.
Emphasizing Certainty
Emphasizes strong certainty about something, leaving no doubt.

I know full well we made the right choice.
Sarcasm or Reproach
Can express sarcasm or reproach when the speaker thinks the listener is pretending ignorance.

Oh, you know full well what you did wrong!
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