What does "cheer up" mean?

To become happier or less downcast.

What is a synonym for "cheer up"?

Common synonyms include: brace up, brighten, buck up, cheer, chirk up, console.

intj, verb

intj, verb ·Rare ·Advanced level

Verb

1
To become happier or less downcast. idiomatic, intransitive
"I cheered up after seeing the results."
2
become cheerful wordnet
3
To make someone happier or less downcast. idiomatic, transitive
"The arrival of the unexpected letter cheered him up almost immediately."
4
cause (somebody) to feel happier or more cheerful wordnet

Intj

1
An encouragement to somebody who seems unhappy.
"Cheer up! Things could be worse."

"I cheered up after seeing the results."