Wiktionary
vb. 1 (context transitive inseparable idiomatic slang English) To defeat ((non-gloss definition: especially) in an argument), get the better of, achieve a success over, gain an advantage or win points over, make a point to the detriment or at the expense of, make appear foolish. {{non-gloss definition|Sometimes with particle (term on (someone)).}} 2 (context transitive separable idiomatic English) To delete or remove (especially from a list); to score out, strike out or strike off, cross out or cross off; to draw a line through. 3 (&lit score off English) To score from.
Usage examples of "score off".
Given the chance, she'd pay our score off, double quick - that's why the chapatti business upset me.
Joey Lorenzo had completely fooled her, making believe he cared, while all the time he was waiting to score off her and then who knows?
He was trying to score off me as usual, an' he said, 'Have ye seen the paper this morning, O'Hara?
Nor needs none shaft ne stele from Phenicia or Little Asia to obelise on the spout, neither pobalclock neither folksstone, nor sunkenness in Tomar's Wood to bewray how erpressgangs score off the rued.
But you can't score off me with this one because I've got nothing to hide.
It was a depressing fact that in the past, when no one would admit to knowing who they could score off, she had had to rely on knowledge accumulated through the job.
They were too dashed clever, and always seemed to be waiting for a chance to score off a fellow.