Digrigno comes from the verb digrignare, which means "to gnash" or "to grind" (typically teeth). It's a less common, more evocative verb than simply saying "I clench my teeth."
In the song, Marracash sings, "Pure mentre dormo io digrigno i denti" (Even while I sleep, I gnash my teeth). This line powerfully conveys a sense of deep-seated stress, anxiety, or internal struggle that persists even unconsciously, making it a striking and memorable word choice.
Marracash opens the song quitting things: the worrying, the pills, the coffee. Then he admits he cannot tell which way it actually runs. "Ma non so se sono loro che mi buttano giù / O io che sono giù e che me la prendo con tutto" (But I don't know if it's them that bring me down / Or if I'm down and take it out on everything). The rest of the verse is him trying to live like the person he is singing to, someone who wakes up early and never has time for a doubt, while underneath it all "Tutto sotto controllo, tranne i sentimenti" (Everything under control, except feelings). He grinds his teeth in his sleep.
The chorus turns the relationship into a circus act with the safety equipment taken away: "Tanto ormai siamo bravi a cadere" (After all, we are good at falling), and "Non c'è mai stata una rete" (There's never been a net). Falling is the one thing the two of them have had enough practice at. By the last verse the whole argument has shrunk to a phone lighting up at the wrong hour, "Lei che mi messaggia alle 02:22" (She who messages me at 02:22), and a Brexit joke he hides behind instead of answering. What he ends on is "Che in fondo vivere è convivere / Con te stesso" (That in the end living is coexisting / With yourself). This is the lungs track on Persona, the album where Marracash gives every song a body part, and breathing is the thing nobody notices until it stops working.