ADJ

human
left, right
The left brain controls the right-hand side of the body

BRAIN + NOUN

cell, tissue
region
function, process
activity
damage, disease, disorder, failure, haemorrhage, illness, injury, tumour
scan
surgeon, surgery

PREP

in the/your ~
Doctors tried to reduce the swelling in his brain
on the/your ~
He was found to have a blood clot on his brain. (figurative) He's got football on the brain (= thinks about nothing but football)

PHRASES

blow your brains out
While cleaning his shotgun he had accidentally blown his own brains out

ADJ

fertile, fine, good, great, quick
muddled, tired
My tired brain couldn't cope with such a complex problem
analytical

VERB + BRAIN

rack
We racked our brains but we couldn't come up with a solution
pick sb's (= ask sb for information because they know more about a subject than you)
I need to pick your brains: what can you tell me about credit unions?
take
It doesn't take much brain to work out that both stories can't be true

BRAIN + VERB

function, tick over, work
It's important to keep your brain ticking over
reel
His brain reeled as he realized the implication of his dismissal
register sth
The stopping distance includes the time taken for the brain to register the need to stop

BRAIN + NOUN

power (also brainpower)

PREP

~ behind
the brains behind the robberies

PHRASES

brains and brawn/brains and not brawn, etc.
They relied on brains rather than brawn (= intelligence, not strength)
have a brain for sth
She has a good brain for mathematics