Answer:

KNOW

AnswerCrossword Clue
KNOWHave down pat
KNOWHave the facts
KNOWBe acquainted with
KNOWBe in on
KNOWUnderstand
KNOWRecognize
KNOWHave down
KNOW"Whad'Ya ...?" (radio show)
KNOWBe sure of
KNOWBe aware of
KNOWBe in the loop
KNOWBe intimate with
KNOWHave no doubt about
KNOWNot just suppose
KNOWBe positive
KNOWHave no doubts
KNOW...-it-all
KNOW"I Need to ..." (Marc Anthony hit)
KNOWFeel in one's bones
KNOWComprehend
KNOWPerceive as fact
KNOWUnderstand, as a language
KNOWBe familiar with
KNOWHave the right answer
KNOWGrasp
KNOWMore than suspect
KNOWHave by heart
KNOW... -it-all
KNOWBe certain of
KNOWBe certain
KNOWBe absolutely sure
KNOWDon't have to guess
KNOWMore than think
KNOWNot just assume
KNOWHave memorized
KNOWHave no doubt
KNOWBe confident about
KNOWBe confident of
KNOWHave down cold
KNOWApprehend