the one thing, the only thing

diamondcutter

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Andrea takes classes in everything. She probably even takes a class in how to be annoying, because that’s the one thing she’s good at.
Source: My Weird School 14, Miss Holly Is Too Jolly, Dan Gutman

That’s the one thing she’s good at.

Does this sentence here mean #1 or #2?
1. That’s one of the things she’s good at.
2. That’s the only thing she’s good at.
 

emsr2d2

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The use of "the one thing" means it's the only thing.

It's one thing she's good at = She's good at other things too.
It's the one thing she's good at = It's the only thing she's good at.
 

diamondcutter

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Can we also take “That’s the one thing she’s good at” here to mean “That’s the thing she’s best at”?
 

5jj

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No. That would imply that there were other things she might be good at, merely not so good.
 
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