noun

brains

intelligence, intellect, mastermind

She has the brains for this difficult job.

She has the brains for this difficult job.

He was the brains behind the whole operation.

He was the brains behind the whole operation.

((have the)) brains ((for sth./to-inf)) to have the intelligence for something You have the brains to solve this problem.

((be the)) brains ((behind sth.)) to be the mastermind of something She was the brains behind the project.

Synonyms: intelligence, intellect, smarts, wit

The plural form of 'brain', used figuratively to mean intelligence or mental capacity.

Think of 'brains' (plural) as representing a greater amount of mental power or intelligence.

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