- The definition of worn out is someone who is really tired, or it is something that has been used so much it is breaking, performing poorly or otherwise not able to be fully functional.
An example of worn out is old sneakers with flat treads.
- no longer effective, usable, or serviceable due to wear or overuse
- exhausted; tired out
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- Worn or used until no longer usable or effective.
- Thoroughly exhausted; spent.