Etymology
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brain trust (n.)

"group of experts assembled to give advice on some matter," occasionally used since early 1900s, it became current in 1933, in reference to the intellectuals gathered by U.S. President Franklin D. Roosevelt as advisers; from brain (n.) + trust (n.).

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Definitions of brain trust

brain trust (n.)
an inner circle of unofficial advisors to the head of a government;
Synonyms: kitchen cabinet
From wordnet.princeton.edu