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Act up means to misbehave or malfunction, while bolster up means to support or strengthen something.
Add up means to make sense or be logical, while spark up means to ignite or start a fire or to liven up or energize something.
Be out usually means to be away from home or a specific place, while shout out means to say something loudly and clearly.
Be up means to be awake and out of bed, while brew up means to make a hot drink, usually tea or coffee.
Bear out means to support or confirm something, while dig out means to remove something from a place or uncover something that is buried.