“beat a dead horse”
【意味】
話題を蒸し返す。
【例文】
We were enjoying ourselves at the party tonight. Oh, no! Beth has showed up. We have to leave because she always beats a dead horse about the election when she sees me.
今夜のパーティーは楽しいね。あれ、ベスが現れた。彼女は私を見ると選挙の話を蒸し返すからおいとましましょう。