- (transitive) If someone or something tires someone out, it makes them tired or exhausted.
- The long walk really tired out the dog.
- The long walk really tired the dog out.
- The parents took their son to play in the park to tire him out by bedtime.
- (intransitive) If someone tires out, they become tired or exhausted.
- I can't stay in the basketball game, I'm tiring out.