She tried to cheer up the disappointed child when he failed to win the spelling bee.    From Wordnet, Princeton University. 

Noun : The cheers of the fans filled the stadium. ,words of cheer. ,Their good cheer overcame his depression. ,full of cheer and good spirits. ,tables laden with cheer.    From Dictionary.com. 

Verb (used with object) : The team members cheered their captain. ,The good news cheered her. ,She cheered him on when he was about to give up.    From Dictionary.com. 

Verb (used without object) : She cheered up as soon as the sun began to shine.    From Dictionary.com.