I live next to a London bridge and jumpers is indeed the term for those who take their life by jumping off the bridge.
It's a terrible sight and atmosphere to see all traffic halted, not only on the bridge but along both sides of the Embankment and river traffic. Aside from traffic, people are also cleared from sight and sound, lest they 'encourage' the jumper to jump.
There are kindly signs with phone numbers attached at certain points in the hope that someone desperate will seek help and not jump.
Struggling with estrangement from 2 adult children and dont know where to go from here.
You've not got one that differs from the accepted meaning everyone else knows, that's fine. Flouncing off doesn't disguise what you're doing.

