The term "cheer" has several meanings, depending on its context.
1) As a verb, to cheer means to express approval or encouragement by shouting and clapping, often in unison with others. For example, one might say "Let's all cheer for the team!" when they want everyone to show support by cheering together.
2) Cheer can also refer to an organized group of people who perform choreographed routines and stunts at events such as sports games or competitions. These groups are often referred to as "cheerleading squads."
3) In a more general sense, cheer can mean to give someone encouragement or comfort in difficult times. For example, one might say "I'm here to cheer you up" if they want to make the other person feel better with their presence and support.