To put an end to something; to bring something to a close; to close the books (figuratively).
その不祥事に終止符を打つために、会社は徹底調査を行った。
To put an end to the scandal, the company carried out a thorough investigation.
彼は長年の迷いに終止符を打つことに決め、退職を申し出た。
He decided to put an end to years of uncertainty and submitted his resignation.
この合意が両国の国境問題に終止符を打つことを期待している。
We hope this agreement will put an end to the border issue between the two countries.