Beat a dead horse
The phrase "beat a dead horse" means to continue discussing or pursuing a topic, idea, or action that has already been thoroughly exhausted or is no longer productive, useful, or relevant. It implies wasting time, energy, or resources on something that is already finished or irrelevant.
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You will never be “out of your element” thanks to multiple difficulty levels and phrase libraries provide idiom puzzles for all levels from students to English learners to fluent adult English speakers.
Just Saying is “the real McCoy” of phrase games!