n. 25B6; verb
she doesn't know I'm here : BE AWARE, realize, be conscious, be informed; notice, perceive, see, sense, recognize; informal savvy, latch on.
I don't know his address : HAVE KNOWLEDGE OF, be informed of, be apprised of; formal be cognizant of.
do you know the rules : BE FAMILIAR WITH, be conversant with, be acquainted with, have knowledge of, be versed in, have mastered, have a grasp of, understand, comprehend; have learned, have memorized; informal be clued up on.
I don't know many people here : BE ACQUAINTED WITH, have met, be familiar with; be friends with, be friendly with, be on good terms with, be close to, be intimate with; Scottish ken; informal be thick with.
he had known better times : EXPERIENCE, go through, live through, undergo, taste.
my brothers don't know a saucepan from a frying pan : DISTINGUISH, tell (apart), differentiate, discriminate; recognize, pick out, identify.