What does "allargando" instruct a performer to do?

The term "allargando" instructs a performer to gradually slow down the tempo while often also suggesting a slight increase in volume. This technique is typically used to create a more expressive and emotional conclusion or passage in a piece. By slowing down, the performer allows the music to resonate, enhancing its lyrical quality. This term is often seen in the context of a climax or a significant moment in the composition where a more dramatic effect is desired. Understanding this term helps musicians to interpret compositions with depth and nuance, contributing to a more compelling performance.