What does "join the cause" mean here?
A "cause" is a movement or goal that people are committed to. The expression "join the cause" means to choose to be a part of a "cause" that people are advocating for. In this case, the clip doesn't tell us what the "cause" is that they are talking about. Ex: Did you hear about the protestors fighting for animal rights? Maybe we should join that cause. Ex: Henry joined the cause to make break time longer at school. All his classmates wrote a letter to the principal about it.
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