Wiktionary
vb. (context British idiomatic informal English) To have a romantic assignation with.
Usage examples of "get off with".
One or two of those ships were going to get off with no more than a dozen or so birds, while others were going to be attacked by scores of them, but it didn’.
One or two of those ships were going to get off with no more than a dozen or so birds, while others were going to be attacked by scores of them, but it didn't really matter.
The message we were finally able to get off with it wasn't too coherent, but it was effective enough.
Why, a smart lawyer like you might be able to get off with only a half-dozen or so years.
Well, they tell `im that if `e says where the jewellery is, `e'll get off with a short sentence an' if `e don't he'll get a seven-year stretch.
Two of the carriers have catapults down, so the dragons can't get off with a full load of bombs anyway.