What does run out of steam mean?

The meaning of "run out of steam" is:

(verb) to lose energy or interest

Example Sentences:

A: Are you still enjoying your Art class?
B: No, I’m really running out of steam. The teacher is boring and I hate art.
A: Perhaps you should’ve chosen a different course.

After running for 10 km, Robert started to run out of steam and had to take a break.

Tiffany ran out of steam while studying for her final exam, and fell asleep at her desk.

From the Blogs:

Has Sonic finally run out of steam


run out of steam

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