1) Aroma 1) Cognizes 2) Has down 3) Has down cold 4) Has down pat 5) Has memorized 6) Has met before 7) Has no doubt about 8) Has no doubt of 9) Has no doubts 10) Has the 411 11) Has the answers 12) Is a friend of 13) Is acquainted with 14) Is aware of 15) Is cognizant 16) Is familiar with 17) Is friends with