Miele literally translates to "honey". It's a sweet and evocative word that immediately brings to mind something precious and delightful.
In the song, it's used in a fascinating contrast: "È una lama che sa di miele" (It's a blade that tastes of honey). This oxymoron creates a powerful image of something beautiful and tempting that is also dangerous or painful, perfectly capturing the bittersweet nature of love described in the lyrics.
"Miele" is a bittersweet breakup song. The singer is speaking to someone who left without leaving anything behind, and she admits she probably showed him her worst side. She stays awake wondering why, watching the rain fall over the city where they once loved each other.
She won't beg for promises or ask him not to move on, but she confesses that meeting someone new sometimes brings back exactly what life felt like with him, and how strange it feels without him now.
The title line describes love as a blade that tastes like honey, something sweet and painful at once. Even with a glass shattering on the floor, she keeps hoping he'll come back to her the way a train comes back every Sunday, sometimes for no real reason at all.