[A]

- airhead: empty-headed person; a silly or stupid person

 

[B]

- birdbrain: stupid person

- bird-brained: stupid in an annoying way

 

[C]

- 

 

[D]

- Don't bite my head off: Don't yell at me

- Don't let it go to your head: Don't let it make you too proud.

 

[E]

- eyes in the back of one's head: can see what's going on behind sb

 

[F]

 

[G]

- Get out of my hair: Stop bothering me

 

[H]

- hair-raising: scary

- have one's head in the clouds: be daydreaming

- have rocks in one's head: Not thinking straight

- headline: title of a newspaper story

- head of lettuce: lettuce plant shaped like a head

- head over heels in love: totally in love

- heads will roll: People will get in trouble

- heads up: watch out

- He has sports on the brain: He can't think of anything but sports

- He's a real brain: He's so smart

 

[I]

- I'd lose my head if it weren't attached to my shoulders: I'm always misplacing things

- It made my hair stand on end: I was terrified

- It was her brainchild: It was her idea

 

[J]

 

[K]

- keep your head above water: to manage to live or keep a business working even though you are not earning much money

 

[L]

- lamebrain: stupid person 

- laughing his head off: laughing very hard

- Let's put our heads together: Let's think about this

- let your hair down: Be natural and relaxed

 

[M]

 

[N]

 

[O]

 

[P]

 

[Q]
 

[R]

 

 

[S]

- scatterbrain: person who can't concentrate
- Sth goes over one's head: Sb doesn't understand sth

- so fast it will make your head spin: very fast

 

[T]

- tear one's hair out: be very frustrated

- the brains of the outfit: the smartest person in the group

- the class brain: the student with the most knowledge

- the head of the class: the top student in the class

- They gave him a head start: They let him begin the race early.
- to brainstorm: to think of ideas as a group

- to bury your head in the sand: to ignore or hide from danger

- to get a swelled head: to get conceited

- to keep your head: to remain calm

- to say off the top of your head: to say quickly, without planning

- Two heads are better than one: If we think together, we can solve it

 

[U]

 

[V]

 

[W]

- way to use one's head: way to think under pressure

 

[X]

 

[Y]

- You're out of your skull: You're silly

 

[Z]