score off

Short definition from Wiktionary

Verb

1. 1
   To defeat (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. Sometimes with particle on (someone).
2. 2
   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. 3
   To defeat (someone) verbally; to win a confrontation with words; to tell (someone) off.
4. 4
   Used other than figuratively or idiomatically: see score, off. To score from.

Noun

1. 1
   The action or result of scoring off someone (a rebuttal, a point won).