wind up (PHRASES)
Brit. Informal tease or irritate.
— ORIGIN Old English, go rapidly, twine; related to WANDER and WEND.
Pronounciation guide: Wind as in mind as opposed to the wind that blows!
To wind up is to tease, for example by telling a false story designed to elicit a particular reaction, for example telling someone in a block of high rise flats that their lifts were to be disabled to encourage fitness
A wind up merchant is London slang for someone who makes a habit of teasing people on a regular basis (eg Assistant!Jo … just saying)