If you lose your head, you panic or do not remain calm in a difficult situation.She was able to keep her head and not panic..., She lost her head and started screaming at me.When we stop enjoying ourselves we'll knock it on the head.Phrases such as laugh your head off and scream your head off can be used to emphasize that someone is laughing or screaming a lot or very loudly.He carried on telling a joke, laughing his head off.If you say that someone is off their head, you think that their ideas or behaviour are very strange, foolish, or dangerous.If you stand an idea or argument on its head or turn it on its head, you think about it or treat it in a completely new and different way.Their relationship turned the standard notion of marriage on its head.If something such as an idea, joke, or comment goes over someone's head, it is too difficult for them to understand.I admit that a lot of the ideas went way over my head.If someone does something over another person's head, they do it without asking them or discussing it with them, especially when they should do so because the other person is in a position of authority.He was reprimanded for trying to go over the heads of senior officers.If you say that something unpleasant or embarrassing rears its ugly head or raises its ugly head, you mean that it occurs, often after not occurring for some time.There was a problem which reared its ugly head about a week after she moved back in...If you stand on your head, you balance upside down with the top of your head and your hands on the ground.If you say that you cannot make head nor tail of something or you cannot make head or tail of it, you are emphasizing that you cannot understand it at all.If somebody takes it into their headto do something, especially something strange or foolish, they suddenly decide to do it.He suddenly took it into his head to go out to Australia to stay with his son.If a problem or disagreement comes to a head or is brought to a head, it becomes so bad that something must be done about it.These problems came to a head in September when five of the station's journalists were sacked.If two or more people put their heads together, they talk about a problem they have and try to solve it.So everyone put their heads together and eventually an amicable arrangement was reached.If you keep your head above water, you just avoid getting into difficulties; used especially to talk about business.We are keeping our head above water, but our cash flow position is not too good.If you say that heads will roll as a result of something bad that has happened, you mean that people will be punished for it, especially by losing their jobs.The group's problems have led to speculation that heads will roll.If you head off a person, animal, or vehicle, you move to a place in front of them in order to capture them or make them change the direction they are moving in.He changed direction swiftly, turned into the hallway and headed her off.If you head something off, especially something unpleasant, you take action before it is expected to happen in order to prevent it from happening.He would ask Congress to intervene and head off a strike...You have to be good at spotting trouble on the way and heading it off.The person who heads up a group, organization, or activity is the leader of it.Judge Frederick Lacey headed up the investigation...We asked ourselves what we wanted from our management structure and who we wanted to head it up.If you describe someone as a big head, you disapprove of them because they think they are very clever and know everything.To dead-head a plant which is flowering means to remove all the dead flowers from it.If you say that someone is a deadhead, you mean that they are stupid or slow.The head boy of a school is the boy who is the leader of the prefects and who often represents the school on public occasions.If someone head-butts you, they hit you with the top of their head.He was said to have head-butted one policeman and stamped on another's hand.The cuts on Colin's head could only have been made by head-butts.If you do a head count, you count the number of people present.