Here's how:
Synonym:
* Upset can be a synonym for words like sad, distressed, angry, disappointed, frustrated, etc.
Antonym:
* Upset can be an antonym for words like happy, content, joyful, pleased, calm, etc.
Example:
* Synonym: "She was upset after losing the game." (meaning sad or disappointed)
* Antonym: "He was upset about the good news." (meaning surprised or shocked, the opposite of happy)
Therefore, to determine whether "upset" is a synonym or antonym, you need to consider the specific word it's being compared to and the context of the sentence.