idler

Meaning

1. One who idles; one who spends his or her time in inaction.
2. One who idles; a lazy person; a sluggard.
3. Any member of a ship's crew who is not required to keep the night-watch.
4. A mechanical device such as a pulley or wheel that does not transmit power through its own axle, but forms part of a gear train, supports a moving belt, etc.

loafer

lazy person

idle wheel

idle gear

ne’er-do-well

dead-beat

lazy fellow

slow-coach

lazy-bones

lazy boy girl

good-for-naught

idler pulley

loaf around

shote

chair warmer

badly-behaved person

quarrel-some person

unruly person

jockey pulley

jockey wheel

tension pulley

block bearing

carrying idler

dead pulley

free pulley

intermediate wheel

jockey roller

gape-seed

ne’er-do-weel

tightening pulley

takeup pulley

lazy man

worthless man

pedestal bearing

free-rolling wheel

gear idle

idling gear

no-live load

idling sprocket

idle pulley

idler gear

loose pulley

From idle + -er.

New

idle

1. To spend in idleness; to waste; to consume.
2. To lose or spend time doing nothing, or without being employed in business.
3. Of an engine: to run at a slow speed, or out of gear; to tick over.
4. To cause (an engine) to idle(3)