uncoupling

verb

1. (form-of, gerund, participle, present)present participle and gerund of uncouple

noun

1. The act by which persons or things are uncoupled.

   “It is the first British yard in which every activity of hump marshalling, except for the driving of the hump locomotive and the uncoupling and coupling of wagons, is fully automatic or drastically simplified by modern aids.”

   “This uncoupling done, Gimbert opened the regulator as Nightall climbed back onto the footplate, in order to pull the one burning wagon away from the rest of the bomb-laden train.”