The line that contains a metaphor is "Keep it like a warm coat. The speaker tells his beloved to keep the poem as "a warm coat" or as "a pair of thick socks which can protect her from the cold"
A metaphor is a figure of speech that, for rhetorical effect, directly refers to one thing by mentioning another.
When comparing his poem with a coat and a pair of socks, the speaker uses the poetic device of the simile.
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