
Pump in
Physical Transfer
Used when referring to the actual movement of a substance through space, often by machinery.

The plant pumps in coolant to prevent overheating.
Continuous Action
Describes an ongoing or sustained action, not just a one-time event.

We need to keep pumping in fresh oxygen for the patients.
Necessity or Improvement
Suggests adding something essential or to enhance something that already exists.

The greenhouse pumps in extra CO2 to boost plant growth.
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