To strike back or retaliate; to return a blow or score a rebuttal (often implies gaining a small victory or reply against an opponent).
ライバルに一矢報いるため、チームは最後まで全力で戦った。
To get back at their rival, the team fought with full force until the end.
彼は批判に対して冷静に一矢を報いた。
He calmly struck back at the criticism.
試合終盤でようやく一矢報いることができた。
They were finally able to strike back in the late stages of the match.