beat one's head against a wall
To struggle uselessly against something that can't be beaten or helped; not succeed after trying very hard.
Trying to make him change his mind is just beating your head against a wall.
big head
Too high an opinion of your own ability or importance; conceit.
When Jack was elected captain of the team, it gave him a big head.
bite one's head off
To answer someone in great anger; answer furiously.
I'm sorry to tell you that I lost my job, but that's no reason to bite my head off!
blockhead
An unusually dense, or stupid person whose head is therefore exaggeratedly compared to a solid block of wood.
Joe is such a blockhead that he flunked every course as a freshman.
bonehead
An unusually dense or stupid person.
John is such a bonehead - small wonder he flunks all of his courses.
bring to a head
To cause some activity to reach the point of culmination.
Time is running out, gentlemen, so let us bring this discussion to a head.
cash on the barrelhead
Money paid at once; money paid when something is bought.
Father paid cash on the barrelhead for a new car.
Some lawyers want cash on the barrelhead.
count heads
count noses
To count the number of people in a group.
Пересчитать количество людей в группе.
On the class picnic, we counted heads before we left and when we arrived to be sure that no one got lost.
The usher was told to look out into the audience and count noses.
I'll have to count noses before I take the children out for a walk.
Мне нужно будет пересчитать детей до того как я поведу их на прогулку.
The young teacher can hardly count the noses, because it is her first day at work.
Молодой учительница едва может подсчитать количество учеников, потому что это ее первый день на работе.