1.a cry or shout of approval
2.the quality of being cheerful and dispelling gloom;
flowers added a note of cheerfulness to the drab room
1.give encouragement to
2.show approval or good wishes by shouting;
everybody cheered the birthday boy
3.cause (somebody) to feel happier or more cheerful;
She tried to cheer up the disappointed child when he failed to win the spelling bee
4.become cheerful
5.urge on or encourage especially by shouts;
The crowd cheered the demonstrating strikers