This line tell us that love does not give us drinks or food. The speaker dismisses  love by using not and nor.  
Love is not all: it is not meat nor drink
Nor slumber nor a roof against the rain
This line tells us that love doesn't give us a bed to sleep on or a roof to protect us from rain. This line is important because it tells us that love is useless and has no meaning.
This poem uses imagery.  Imagery is important because it gives you something to imagine while reading a story or anything. It helps you understand whats going on by letting you imagine the scene. In lines 3 and 4, its gives us enough to see a man drowning, floating up and down, looking for something to hold onto.
The turn takes place on line 7 and 8. Before the turn, the speaker talks about how love doesn't have any value because it doesn't give you necessities. But in line 7, she says "yet" which gives us the idea that love might have some value because men will risk their life for love. If love has the power to compel men to die for it, it suggests that it has more value than she originally thought.
This line explains that the speaker would trade a memory for food. It shows us that love has no use, it doesn't give us food so its meaningless.
Or trade the memory of this night for food
It may well be. I do not think I would.
The theme of the poem is that love is powerful. Though it may not give us the basic needs, it gives us sentimental things. It gives us memories and happiness.
This line summarizes the whole poem. The speaker says that love has no value but as she thinks about it, men will risk their life for it so it has a different value. It may not give us food or a roof, but it gives us memories and happiness; so she wouldn't trade it.
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