|Noah Webster's Dictionary|
(adv.) In a smooth manner.
Smoothly (2 Occurrences)
Proverbs 23:31 Don't look at the wine when it is red, when it sparkles in the cup, when it goes down smoothly. (WEB JPS ASV BBE DBY NAS RSV NIV)
Song of Songs 7:9 Your mouth like the best wine, that goes down smoothly for my beloved, gliding through the lips of those who are asleep. (WEB JPS ASV BBE DBY NAS RSV)