a cry or shout of approval
"The crowd let out a loud cheer when their team scored the winning goal."
the quality of being cheerful and dispelling gloom
"flowers added a note of cheerfulness to the drab room"
A cheerful attitude; happiness; a good, happy, or positive mood.
"The team wore bright uniforms and cheered loudly to boost their morale before the big game."
Cheerleading.
In plain English: A cheer is an enthusiastic shout of praise or encouragement, usually made by a group of people to support someone else.
"The crowd's cheers filled the stadium after the team won the game."
Usage: Use the noun cheer to describe an upbeat atmosphere or general spirit rather than a specific emotion like joy. As a verb, it is commonly paired with "up" when referring to lifting someone's mood after they have become discouraged.
cause (somebody) to feel happier or more cheerful
"She tried to cheer up the disappointed child when he failed to win the spelling bee"
To gladden; to make cheerful; often with up.
"The news cheered us all up by bringing a smile to our faces."
In plain English: To cheer is to shout happy things to make someone feel better or more excited.
"The team cheered when their favorite player scored the winning goal."
The word "cheer" comes from the Middle English chere, which originally meant a person's head or facial expression. It traveled into modern usage to describe one's mood and hospitality through its roots in Old French and Late Latin words for face and appearance.