"idles" in the noun sense
1. idle
the state of an engine or other mechanism that is idling
"the car engine was running at idle"
"idles" in the verb sense
1. idle, tick over
run disconnected or idle
"the engine is idling"
2. idle, laze, slug, stagnate
be idle exist in a changeless situation
"The old man sat and stagnated on his porch"
"He slugged in bed all morning"
Source: WordNet® (An amazing lexical database of English)
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