Have a strong intention to say or to do something; the expression dates from the early 1500s.
In the sense of an injunction to lighten up or go easy dates from the early 20th century.
see Take or have a leak
To have a monkey on one’s back is to have a very irritating, ongoing problem. The expression dates from the mid-19th century when it originally meant...
To be mad or insane is the opposite of having one’s head screwed on the right way, both metaphors date from the late 18th/early 19th century, hence, s...
see Sweet tooth
see Catch/have a tiger by the tail
see At full tilt
see Axe to grind
see Bigger/other fish to fry
see Egg on one’s face
see On one’s plate
see Eyes bigger than one’s belly
see Eyes in the back of one’s head
see In spades