What is the definition of 'decrescendo' (decresc.) in music?

Decrescendo, often abbreviated as "decresc.", indicates that the music should gradually become quieter. This term is derived from the Italian word "decrescere," meaning to lessen or decrease. In a musical context, it instructs performers to reduce the volume over a specific passage, creating a sense of fading or softness. This dynamic contrast can enhance emotional expression within a piece, allowing for dramatic shifts in intensity and creating a more nuanced performance.

It's essential to understand that this term specifically refers to the act of diminishing sound, as opposed to the other options that describe different dynamics or emotional expressions in music.