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ODEearwigger

earwigger

Flag: gbEnglishOxford Dictionary of English

earwigger /ˈɪəwɪɡə /
noun British English informal a person who secretly listens to a conversation:
just how much did you hear, you little earwigger?.
– ORIGIN late 18th century (in the sense a person who seeks to influence others in secret): from earwig + -er1.