Understudy 
To dream of being the understudy in a play or production is a sign that you are the only one standing in the way of a possible successful future. There is an implication that you may need to grow in confidence and put yourself out there a little more to achieve your ultimate success.
Cheerleader
To dream of a cheerleader symbolizes rivalry and success. Perhaps you should recognize the strengths and achievements of others and voice this recognition to them.
To dream that you are a cheerleader indicates that you possess a positive attitude and you are very sure of yourself. It suggests that need to place more energy into a certain issue.
Booster Cables
Dreaming of booster cables symbolizes reviving something. Dreaming that you are attaching the booster cables to something represents your effort to revive something associated with that object. For instance, trying to revive your bed means you may be searching for a way to enhance your sex life.
Attaching booster cables to a person symbolizes your hopes or desires to revive that person either literally (generally when the person is sick or dead) or figuratively (such as reviving a relationship).
Using booster cables on your car in a dream is a general symbol of small issues and frustrations that are currently happening in your daily life.
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