Definition of earplug noun from the Oxford Advanced Learner's Dictionary

 

earplug

 noun
noun
BrE BrE//ˈɪəplʌɡ//
 
; NAmE NAmE//ˈɪrplʌɡ//
 
[usually plural]
 
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a piece of soft material that you put into your ear to keep out noise or water
See the Oxford Advanced American Dictionary entry: earplug