morendo
/məˈrɛndəʊ/ /mɒˈrɛndəʊ/Music
adverb
As a musical direction: with the sound gradually dying away. Also as noun: a style of performance using such an effect.
Origin
Early 19th century; earliest use found in Thomas Busby (1754–1838), composer and author. From Italian morendo, gerund of morire to die from classical Latin morī.