Giving in after being worn down by someone's persistence; succumbing because one runs out of patience or endurance.
子どもが毎日おもちゃをねだるので、つい根負けして買ってあげた。
My child begged for the toy every day, so I finally gave in and bought it.
何度も説明しても納得しないので、彼は根負けして話を切り上げた。
Even after explaining many times, he wouldn't agree, so I gave up and ended the discussion.
交渉で相手の粘り強さに根負けし、条件を受け入れた。
In negotiations I was worn down by the other side's persistence and accepted their terms.