Moving without using power or effort, especially riding downhill or moving with momentum; or doing something without much effort or enthusiasm.
From 'coast' which comes from Old French 'coste' meaning rib or side, then came to mean the edge or shoreline. The modern sense of coasting without power developed by the 1800s.
When kids coast downhill on bikes without pedaling, they're actually demonstrating Newton's First Law of Motion—an object in motion stays in motion unless something stops it!
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