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What does "I bought that smirk" mean here? Could you give some more example sentences for better understanding?

A: He's not as great as he looks. I bought that smirk.


B: Jealous?
A: No, I'm just a bit tired. It's been a long day and we still have a long way to go before we get home and we might even get caught.
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A slang meaning of I bought something is I believed it.

1) eg I bought his explanation. (I believed it was the truth.)

2) eg I bought his apology. I think he was genuinely sorry)

3) eg I didn't buy that smirk. (He seems to think that he is in a better position than we are, but I think he is wrong.)

After I read these examples, I 'm not sure if #3 really works. Some more context would help.

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B: Jealous?
A: No, I'm just a bit tired. It's been a long day and we still have a long way to go.

Clive

Comments  
Hasibrahman What does "I bought that smirk" mean here? Could you give some more example sentences for better understanding?

To buy something can mean to believe it.

"accept, believe - I don't buy that hooey." ( https://www.merriam-webster.com/dictionary/buy )

Person A is saying that they were deceived by the look on his face into thinking he was better than he was.

You can say you totally bought Ben Kingsley as Gandhi. When a politician makes a promise, you might not buy it. You often see "buy into". If an inspirational speaker goes overboard, you might have trouble buying into his philosophy.

 Clive's reply was promoted to an answer.