Related Clues:

• In the ___ (informed)
• Have down cold
• 'Well, what do you ___?!'
• -- out (investigate, to a Brit)
• Be intimate with
• Have down pat
• Have no doubt about
• Flesh (out)
• Have in one's head
• See 97 Across
• Be aware of
• Have mastered
• Be familiar with
• Be cognizant of
• Be certain about