An idiom meaning someone always has a comeback or objection to everything; ready to contradict others, often blocking discussion.
彼はいつもああ言えばこう言うから、話が進まない。
He always has a comeback for everything, so the conversation doesn't progress.
親の忠告にもああ言えばこう言う態度を取る子どもが増えている。
There are more kids who always argue back at their parents' advice.
会議でああ言えばこう言う同僚がいると、決定が遅れる。
If there's a colleague who contradicts everything in a meeting, decisions get delayed.