fare la scarpetta

Literally, “to make/do the little shoe”, after the shape the piece of bread assumes.

fàre la scarpetta (first-person singular present fàccio la scarpetta, first-person singular past historic féci la scarpetta, past participle fàtto la scarpetta, first-person singular imperfect facévo la scarpetta, second-person singular imperative fài la scarpetta or fà' la scarpetta, auxiliary avére)

1. (idiomatic) to mop up the sauce from a plate of food with a piece of bread