Sure, the word “upside” has a meaning of the opposite of the word “downside.”

Definition:

• Upside: The upper or upper side of something.
• Upside-down: The reverse of something, with the top part at the bottom and the bottom part at the top.

Example sentences:

• The coin is on its upside.
• The tree is upside down.

Additional notes:

• The word “upside” is commonly used in informal speech.
• The word “upside down” is a phrase that is often used to describe things that are in the opposite position to what they should be.
• The word “upside” is also used in idiomatic phrases, such as “on the upside” and “upside down.”