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Definition of Score off
1. Verb. (transitive inseparable idiomatic slang) 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)).) ¹
2. Verb. (transitive separable idiomatic) 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. ¹
3. Verb. (&lit score off) To score from. ¹
¹ Source: wiktionary.com