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To use someone who is not a professional in a field as a source to support a theory/argument in that field. ex) to use a famous wrestler as authority to speak about astronomy. they are famous so people will listen to their authority, even if there’s no correlation to their expertise and the topic of space
Resolution is the answer to your question !
Seems as though she must be angry, or embarrassed. That is the only time your cheeks would heat up like that. The author is using a simile. A simile is comparing something using like or as. :)
It’s a conjunction because it’s using for to state why she left and it continues the sentence