One of the mysteries of the English language finally explained.
1A person who takes credit for or benefits undeservedly from the intellectual labour of others; a plagiarist, a parasite.
2A person who or thing which feeds on brain matter; (hence) something regarded as harmful to the intellect.
Late 18th century. From brain + sucker.
brain sucker/ˈbreɪn ˌsʌkə/
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