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Idle functions primarily as an adjective describing something that is not in active use, not operating, or temporarily unoccupied. It can describe machines running without moving, empty desks, or unhurried periods of time. In contrast, idol functions as a countable noun referring to an individual who inspires intense admiration, such as a musical star or respected mentor, or an object treated as sacred.

The assembly line remained idle while technicians repaired the central conveyor belt.