Third-person singular simple present indicative form of stand on one's head

An inability to think clearly and rationally.

To raise one's head. / (idiomatic, of something unpleasant or unwelcome) To appear and cause problems or stress, especially at an inopportune time.

To be discouraged, ashamed, or embarrassed.

(dated) Bizarre ideas.

Without restraint, hesitation, or inhibition; endlessly.

Used other than figuratively or idiomatically: see off, top, head. / (idiomatic) In an extemporaneous manner; without careful thought, preparation, or investigation.

(idiomatic, informal) To laugh uproariously.

(informal, emphatic, postpositive) Absolutely not; used to describe how little one needs an undesirable thing or situation.

(idiomatic, transitive) To understand; fathom; solve.