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1. To force or suck something, as a liquid or gas, out of something by means of a pump: The contractors pumped the water out of the ditch. They pumped out the sewage that had flooded the basement.
2. To force the liquid or gas out of something by means of a pump: When the rain finally stopped, we rented a sump pump and pumped out our basement. The holes had filled with water, so the contractors pumped them out before pouring the concrete footings.
3. To flow out of something rapidly and forcefully: When the firefighters arrived, smoke was pumping out of the windows. Blood was pumping out, so the doctor tied a tourniquet around the patient's arm.
4. To produce something continuously and in large amounts: That factory pumps out a lot of toxic waste. Movie sequels continue to make money, and studios continue to pump them out.