Longman Dictionary of Contemporary English homepage

pipeline

 noun
     
Related topics: Engineering
pipe‧line [countable]
1TE a line of connecting pipes, often under the ground, used for sending gas, oil etc over long distances
2

be in the pipeline

if a plan, idea, or event is in the pipeline, it is being prepared and it will happen or be completed soon:
More job losses are in the pipeline.
Definition from the Longman Dictionary of Contemporary English
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