Related Clues:

• 'Well, what do you ___?!'
• See 7-Across
• Be intimate with
• Have down pat
• Have no doubt about
• Have in one's head
• See 97 Across
• Be aware of
• Have mastered
• Be familiar with
• Be cognizant of
• Be certain about
• ___-Nothingism
• Be confident of
• See to it