cell

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little grey cells

brain cells (as symbolic of high intelligence or mental acuity).
The phrase is particularly associated with the cerebral Belgian detective Hercule Poirot , invented by Agatha Christie .
2006 Scotland on Sunday They…show an amazing capacity to solve every cryptic clue, code and secret that comes their way, often merely by the use of their little grey cells and a leap of the imagination.
See also: cell, grey, little

not have two brain cells, pennies, etc. to rub toˈgether

(British English, informal) be very stupid, have no money, etc: How can they afford a new car? They haven’t got two pennies to rub together.
See also: brain, have, not, rub, together, two