As a Noun: 1. A sweet substance, often in the form of white or brown crystals, which is used to sweeten food and drink. English = sugar. 2. [Only some signers, especially when they say the word "diabetic" with their lips] a person who has diabetes. English = diabetic. As a Verb or Adjective: 1. To add sugar to food; to sprinkle sugar on food; to sugar.