reciprocate

A UK source said "the ball is firmly in the Russian court. Will they reciprocate and stop the fighting to allow serious negotiations on a lasting peace or will they continue to slaughter innocent civilians?"

Key trade partners have reciprocated in kind and have an incentive to up the ante.

Other times they simply look for containers with high-security locks, which they cut with reciprocating saws or bolt cutters, a Homeland Security Investigations special agent said in affidavits filed in federal court.

He actually asked to borrow a special reciprocating saw so he could saw through some drywall that had fallen over on his office.

Trump said that he's taking an eye-for-an-eye approach to international trade, saying the U.S. will now reciprocate tariffs on any country that imposes duties on American goods.