(idiomatic) To think carefully, especially as an alternative to being guided by one's emotions. / (humorous) To headbutt.

(idiomatic) To keep one's cool; to stay calm.

To collaborate in a mental task, such as generating ideas.

past participle of give her her head, indicating a passive voice. / past participle of give her head, indicating a perfect tense.

(UK, Australia, informal, idiomatic) To frustrate, infuriate, irritate or disturb someone.

plural of head-up display

Alternative form of like a chicken with its head cut off

Alternative form of out of one's mind

Insane, crazy. / Temporarily mentally unstable; very distressed. / Under the influence of drugs.

(computing) An addressing system of hard drives where the hard drive is addressed by its cylinders, heads, and sectors.