sordino
/sɔːˈdiːnəʊ/noun
(pl. sordini /-niː/)
1- Music a mute for a musical instrument【乐】弱音器。
1.1
sordini
(on a piano) the dampers（钢琴的）制音器。
词源
late 16th cent.: from Italian, from sordo 'mute', from Latin surdus.