be something that sb cannot understand, especially talk or writing that is obscure, allusive

She leant across and said, `;This is all Greek to me.'; BNCI

If this is all greek to you and you want more information, all you need is a satellite digital receiver. WebC

If all this sounds more than a little confusing and inaccessible, anyone not well schooled in the Greek tale is indeed likely to be swept with a sense of "this is all greek to me." WebC

two people who are completely different from each other

Or in other words, the ways in which differences are described
in the USA and Britain are... like chalk and cheese. Google

At the root of this unhappy state of affairs is not just the fact that the
two sides are like chalk and cheese.  Google

Judaism and Christianity are like chalk and cheese. google

be physically very strong but not very intelligent

There is a perception that Domi is all brawn and no brains but that is the furthest thing from the truth. Google

He is all brawn and no brains but don't telll him that to his face, cause he might feed you a knuckle sandwitch.  Google

Someone who is all brawn and no brains....Fred Flintstone would fill that role for us for a solid 10 years. Google

to be very intelligent and able to think quickly

Neil Turner is as bright as a button and as sharp as a blade. Google

He is not yet fully house-trained but is as
bright as a button and quick to learn. He is a normal mischievous puppy.  Google

He is as bright as a button,
and has a gift of bringing a smile to the hardest of faces. Google

if your mind is not working effectively, you may be bored or very tired

 I am brain dead,cant get down load to work. google

 It never gave me a chance to demonstrate whether or not I am brain dead. Google

Had to work late today, and am brain dead.  Google

be very stupid

He is dead from the neck up; a thick,
jarhead tough-guy with no more personality than a bag of bricks. Google

Egalitarianism as a philosophy is dead from the neck up, insofar as
even its adherents do not and, indeed, cannot take it seriously.  Google

This project is dead from the neck up. google

be very tired

Sorry, not much to say but my brain is dog tired, I'm sure my boss hates me. WebC

Even though everybody is dog tired and thoroughly soaked.  WebC

Even now, my H works long hours (his unit is getting ready to deploy) and he is dog tired when he gets home.  WebC

být znechucen, otráven

I am fed up with my treatment by my employer and am thinking of resigning.
 Google

 I am fed up with Disposable Devices and You should be too! Google

 I am fed-up of playing games for fun only. Google

být v něčem o hodně lepší než ostatní  ve skupině

The young runner who won the last race is in a class of his own. Longman Dict. of E. Id.

My mother´s cakes are in class of their own. Logman Dict. of E. Id.

mít u někoho dobrou reputaci (dočasně), být v něčí přízni

He thinks highly of our family and uncle is in his good books. google

Anything and everything Spider-Man
is in his good books. Google

Ramu is not the sort to sign an actor just because he or she
is in his good books.  google

know about a lot about sth which most people do not know about

With skills to match their perseverance it’s only a matter of time before the
overground is in the know and flexing their fingers by pressing ‘play. Google

Everyone who is in the "know" knows their NASCAR. Google

Dan is the man who is in the know about birds of prey. Google

not know what to say

But when the moment came I was lost for words. Google

 I was lost for words, disappointed, devastated and felt jilted. google

I was so surprised to see him I was lost for words.
 google

you know it but you cannot quite remember it

It was on the tip of my tongue to say the boss was out. Google

The phrase "Eat me" was on the tip
of my tongue but I choked it back and left.  google

 Her name was on the tip of my tongue and she could see
I felt awkward that I couldn't remember it, so she told me. Google

be very drunk

He is out of his brain with happiness.  Google

 They met when she was 18 and he was out of his brain on cocaine and
amazingly they fell in love.  Google

John was actually a nice guy when he was out of his brain-washed robot self, as we
discussed rap music, playing basketball on lowered rims, and eating grapes. google

být zavalen (prací, povinnostmi...)

When you go back to the kitchen to ask the cook for it, he is snowed
under with orders, so he screams at you to come back later. Google

He places an advertisement and, very soon, he is snowed under with candidates.
 Google

But, since he started this job and he is snowed under with work, I will
gladly give him a break if it means his stress level is lowered.  google