Eat or drink in sips (3)

I believe the answer is:
sup
(Other definitions for sup that I've seen before include "Eat a late meal; sip" , "Imbibe" , "Take food" , "Drink; eat evening meal" , "Drink; take a late meal" .)
I believe the answer is:
sup
(Other definitions for sup that I've seen before include "Eat a late meal; sip" , "Imbibe" , "Take food" , "Drink; eat evening meal" , "Drink; take a late meal" .)