|beat one’s brains out||If someone beats their brains out, they try very hard to understand something or solve a problem.|
My grandmother beats her brains out every evening trying to do the crossword puzzle in the newspaper.
|brain like a sieve||Someone who has a brain like a sieve has a very bad memory and forgets things easily.|
Oh, I forgot to buy the bread – I’ve got a brain like a sieve these days!
|all brawn and no brain||Someone who is physically very strong but not very intelligent is said to be all brawn and no brain.|
He’s an impressive player to watch, but he’s all brawn and no brain.
|have something on the brain||If you have something on the brain, you think or talk abut it all constantly.|
Stop talking about golf. You’ve got golf on the brain!
|no-brainer||A decision or choice that requires little or no thought, because the best option is so obvious, is called a no-brainer.|
The choice was between a cash refund or having the amount credited to my account – it was a no-brainer. I took the cash!
|brains behind something||Someone who is the brains behind a project or action is the person thought to have planned and organized everything.|
The police have arrested a man believed to be the brains behind the bank robbery.
|pick someone’s brains||If you pick someone’s brains, you ask questions about a particular subject in order to obtain advice or information.|
Could we have lunch together? I’d like to pick your brains about something.
|rack one’s brains||If you rack your brains, you try very hard to think of something or to remember something.|
Christmas is always a hassle for me. I have to rack my brains every year to find ideas for presents.
|wrap your brain around something||If you concentrate on something in an effort to understand, youwrap your braiin around it.|
I need a translation of this report urgently, so wrap your brain around it fast!