英和和英

of a person's mentality, to work in an average way

to think

to rack one's brains―cudgel one's brains―worry （oneself）

move one's head

to lower one's head

Use your head!

to cut one's hair

to make a great effort of the mind in order to understand or find the answer to a difficult question

pillow your head

Use your bean.

to scratch one's head―（恥じてなら）―hang one's head for shame

I am going to have my hair cut.

to cause trouble for someone

an intelligent person

to think very deeply about something

to use one's head―do head-work―do intellectual work―exercise one's intellect

with the head foremost

I'm a bit out of it.

to cover the top of something

the degree to which one's intellectually sharp

I feel out of it.

a rest for the head

to give one's brain a rest

My head throbs.

a blow on the head

the function of the brain

to bow one's head―incline one's head

Use the old bean.

Use your brains.

the condition of being smart and quick to understand