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"Quincy looked to Craig, who had scrambled atop the rock and was studying the horizon. He was interested in more than just sex. Quincy was certain of that. They had been friends first—meeting on their official first day of college and spending all of freshman year engaged in a slow, budding flirtation. The dating part didn’t happen until late August, when both returned to campus realizing how much they had missed each other over the summer. And if Quincy had started to sense some impatience about sex on Craig’s part, she chalked it up to desire and not the kind of pent-up frustration Janelle was implying."

**chalk up = achieve something noteworthy.

"Warner has chalked up an impressive 38 years at the firm"


**pent up =

(of emotions, energy, etc.) unable to be expressed or released.

"pent-up frustrations"

2.

closely confined or held back.

"a surge of pent-up water"

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Hasibul Alam**chalk up = achieve something noteworthy.

That is not the usage here. It is an idiom. See this entry.

https://idioms.thefreedictionary.com/chalk+up

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And if Quincy had started to sense some impatience about sex on Craig’s part, she attributed it to/ thought it was due to / blamed it on / associated it with chalked it up to desire and not the kind of pent-up frustration Janelle was implying."

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Comments  

chalk it up

To link something that has happened to a particular reason or circumstance.But it does not make any sense with that sentence. plz help me
 AlpheccaStars's reply was promoted to an answer.
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