Meaning of “idle” - Learner’s Dictionary

idle

verb uk us /ˈaɪdl/
ENGINE [ I ]

If an engine or machine idles, it runs slowly but does not move or do any work:

He left the engine idling and ran into the shop.
STOP WORKING [ T ] US

to stop someone or something working or being used, often because there is not enough work to do:

The closure of the factory idled about 300 workers.
TIME [ I ]

to spend time doing nothing:

We saw her idling in the school grounds.

(Definition of “idle verb” from the Cambridge Learner’s Dictionary © Cambridge University Press)