Definition of pump-down in English:

pump-down

noun ˈpʌmpˌdaʊn

Mechanics Engineering

The action or process of reducing the pressure of air or other gas inside an enclosed volume by pumping.

1940s; earliest use found in Review of Scientific Instruments. From to pump down at pump.

nounˈpʌmpˌdaʊn

Mechanics Engineering

The action or process of reducing the pressure of air or other gas inside an enclosed volume by pumping.

1940s; earliest use found in Review of Scientific Instruments. From to pump down at pump.

词汇	pump-down
释义	Definition of pump-down in English: pump-down noun ˈpʌmpˌdaʊn Mechanics Engineering The action or process of reducing the pressure of air or other gas inside an enclosed volume by pumping. Origin 1940s; earliest use found in Review of Scientific Instruments. From to pump down at pump. Definition of pump-down in US English: pump-down nounˈpʌmpˌdaʊn Mechanics Engineering The action or process of reducing the pressure of air or other gas inside an enclosed volume by pumping. Origin 1940s; earliest use found in Review of Scientific Instruments. From to pump down at pump.
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