Request that a line of conversation be terminated. Immortalised by Jack Regan in "The Sweeney"
"But Guv, you've got no reason to finger the Bartlett brothers!"
"Leave it out, George!"
Verb. To give a totally inappropriate response to a given stimulus.
"Got a light, mate?"
"Nah, sorry. Left me watch at home!"
The responder has yorded.