It’s a verb please mark me brainliest
I don't know any of the other similes because I have no idea what poem you read but here is the answer to what growing old like an onion could convey:
Onions are layered, as they grow more and more layers grow. This could mean that as Rachel grows, she gains more layers of knowledge and experiences and they keep layering over time as she grows.
You write the essay, restate the question in your first sentence.
