one under

Noun

 * 1)  A person under a train; a person hit by a train after jumping or falling in front of it.
 * 2) * 2002, "Tube Troll", ">Incident @ Hangar lane tube <", uk.transport.london
 * The twist in this tale is that the driver (who was at the back and hadn't seen anything) booked off with stress (as drivers often do after a one under) and the guard who had been driving and witnessed the whold [sic] traumatic event had to creep into work the next day and pretend that nothing had happned...
 * 1) * 2004, "Joe", "TV Alert: BBC3 9pm Trauma TONIGHT", uk.railway
 * About a one under on the Northern line.
 * 1) * 2005, "Neilw001", "'One under'", uk.transport.london
 * I've been on a train when some [sic] has gone under. Actually heard the thump and then the driver on the radio saying "I've got one under".

Usage notes

 * Used primarily in relation to incidents on London Underground, but is also used for other railways in the UK.