noun
a person who interferes or meddles in the affairs of others
adjective
interfering or meddling in the affairs of others
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The committee meeting was going smoothly until a buttinsky interrupted with unnecessary comments.
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I wish that buttinsky would mind their own business for once.
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Why is that buttinsky always sticking their nose where it doesn't belong?
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She's such a buttinsky, always trying to control everyone else's decisions.