sever ties with との関係を断つ

sever ties with someone = cit ties with は関係を完全に断ち切ると言う意味です。0:04 a visit that paved the way for the establishment of diplomatic relations between Beijing and Washington that meant United States severing official ties with Taiwan and adopting what became known as the one-China policy. ニクソン大統領の訪中は米中の国交を正常化する地ならしで、それは同時にアメリカが台湾との国交断絶することを意味し、一つの中国政策を受け入れることでもあった。

China lodges protest over Trump’s Taiwan call

https://www.youtube.com/watch?v=nR-YcjLUThE  0:01 one year into his tumultuous presidential campaign, Donald Trump has unexpectedly severed tied with campaign manager, Corey Lewandowski.
Trump Campaign Manager Corey Lewandowski Out

https://www.youtube.com/watch?v=vWov7A9q_lU  4:36 if they get smart eventually, they can sever the tie that they have with the Euro. スイスがもうちょっと利口になれば、ユーロとの関わりを完全に断ち切ることが出来る。
Peter Schiff: Things bankers are good at – creating inflation, making prices go up

参考リンク
http://bridge-english.blogspot.jp/2010/02/blog-post_7038.html  手切れ金を英語でなんと言うか？

練習問題解答
a-4247 sever ties with
a-4632 severed ties with
b-2883 severed ties with