off one's head
The idiom "off one's head" is commonly used to describe someone who is acting irrationally or is mentally unstable, often in informal contexts.
Definition
B2General
(informal)Mentally unstable or insane.
Example
- People thought he was off his head for talking to himself in public.
B2Behavior
(informal)Acting in a wildly irrational or foolish manner.
Example
- She must be off her head to drive in such terrible weather.
B2Substance Influence
(informal)Under the influence of drugs or alcohol to the point of losing control.
Example
- He was completely off his head after drinking all night.
Similar
Terms that have similar or relatively close meanings to "off one's head":
on one's headoff the top of one's headout of one's mindoff one's boxin one's headover one's headover the headlose one's headhave someone's headhave one's head readoff one's medsflip one's lidtake someone's head offstanding on one's headgo to someone's headturn on its headoff one's gameuse one's headout on one's feethead in the cloudsflip one's wiggo over someone's headheels over headhats offoff one's feedout of itlook offon one's mindhand someone his headbang offtalk through one's hatlose one's mindhead offoff the railsknock into a cocked hathead gameout of handcome off itmake head againstout of one's boxthrow offover the topoff the deep end