The meaning of the metaphor "Trishna was a night owl" means Trishna doesn't sleep too just like a night owl".
<h3>What is metaphor?</h3>
A metaphor is a figure of speech which is used to compare something to something else without using "like" or "as", by making the object.
A metaphor is similar to a simile but a simile uses "like" or "as" in comparison.
From the passage, Trishna is compared to a night owl because she doesn't sleep at night, so she had no problem staying up until the book she was reading was finished.
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