brainbox
noun
brain·box
ˈbrān-ˌbäks
variants
or brain box
plural brainboxes or brain boxes
informal
1
2
chiefly British
: a very intelligent person
I was good at school; I was a total brain box. At a small town school, being brainy was not necessarily an asset.—Karine Polwart, quoted in The (London) Times Educational Supplement, 15 Feb. 2013
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Merriam-Webster unabridged
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