Love at first sight
This passage is describing the way Armand fell in love, in the same way everyone in his family fell in love. It describes the love as being shot by a pistol which shows that it happens immediately the first time they see the person that they are falling in love with.
True
An example is the green light in the book "The Great Gatsby"
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It is a metaphor because the sentence is comparing two different things without using the word "as" or "like".
