Definition of sugar:
(n) :
sucrose in the form of small crystals, obtained from
sugar cane or
sugar beet and used to sweeten food and drink; when used to sweeten drink, an amount of such crystalline sucrose approximately equal to five
grams or one
teaspoon
"he usually has his coffee white with one sugar."
(v) :
to add sugar to; to
sweeten with sugar; to make (something unpleasant) seem less so
"john heavily sugars his coffee."
(interjection) :
used in place of
shit!
"oh, sugar!"