Definition of shrug verb from the Oxford Advanced American Dictionary

 

shrug

 verb
verb
NAmE//ʃrʌɡ//
 
[intransitive, transitive, no passive]Verb Forms present simple I / you / we / they shrug
 
he / she / it shrugs
 
past simple shrugged
 
-ing form shrugging
 
 
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to raise your shoulders and then drop them to show that you do not know or care about something Sam shrugged and said nothing. shrug something “I don't know,” Anna replied, shrugging her shoulders. Phrasal Verbsshrug something off/asideshrug somebody/something off/away
See the Oxford Advanced Learner's Dictionary entry: shrug