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brain

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1brain/ˈbreɪn/noun
pluralbrains
1brain
/ˈbreɪn/
noun
pluralbrains
Learner's definition of BRAIN  
[count]
: the organ of the body in the head that controls functions, movements, sensations, and thoughts — often used before another noun
informal  : the ability to think and reason : intelligence — often plural
informal  : a very intelligent person
◊ If you are the brains of/behind something, you are the person who thinks of plans or makes important decisions for a group.

beat/bash someone's brains out

informalor USbeat/bash someone's brains in
: to hit someone on the head in a way that causes serious injury or death : to beat someone very badly

blow someone's brains out

informal
: to kill someone with a shot to the head : to shoot someone fatally in the head

cudgel your brain/brains

informal + old-fashioned
: to think very hard : to rack your brain

on the brain

informal
: always in your thoughts

pick someone's brain/brains

informal
: to talk to someone in order to get helpful information or advice

rack your brain/brains

— see 2rack
2brain/ˈbreɪn/verb
brainsbrainedbraining
2brain
/ˈbreɪn/
verb
brainsbrainedbraining
Learner's definition of BRAIN  
[+ object]informal
: to hit (someone) on the head very hard
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