Wiktionary
know the score
vb. (context idiomatic English) To be aware of a situation, especially of the consequences of misconduct
WordNet
know the score
v. be well-informed [syn: be with it, be on the ball, know what's going on, know what's what]
Usage examples of "know the score".
Warders has been on the firing line long enough to know the score.
You know the score -just like CINC-TRAIN knew your guys were hitching a ride home on The Lady.
I wanted James Burdick to know the score because if that Boeing came down anywhere in the United States he'd want to be there.
His teammate slammed in and strapped himself into the other chair while General Quarters was still clanging, demanded to know the score.