godan verb (-ku), transitive verb
bully relentlessly; torment thoroughly; abuse to the end
Emphasizes persistent, thorough bullying or torment, often until the victim is completely broken or the situation reaches its worst conclusion. The compound verb いじめ抜く combines いじめる (to bully) with 抜く (to do something to the end/thoroughly).
彼は同級生にいじめ抜かれて、学校に行けなくなった。
He was bullied relentlessly by his classmates and became unable to go to school.
That boss is notorious for tormenting his subordinates thoroughly.