Definition of con sordino adverb from the Oxford Advanced Learner's Dictionary

 

con sordino

 adverb
adverb
BrE BrE//ˌkɒn sɔːˈdiːnəʊ//
 
; NAmE NAmE//ˌkɑːn sɔːrˈdiːnoʊ//
 
(music, from Italian)
 
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(used as an instruction) played using a mute Word OriginItalian.
See the Oxford Advanced American Dictionary entry: con sordino