Beat a dead horse

Origin: The phrase 'beat a dead horse' dates back to the 19th century and is believed to have originated from the literal image of someone futilely trying to get a dead horse to move. The phrase metaphorically illustrates the pointlessness of continuing to discuss or pursue an already settled topic.

Examples

• Even though we have already decided on the project deadline, Mark keeps beating a dead horse by bringing up the same old issues.
• Your continuous complaints about last year's budget cuts are just beating a dead horse; the decision has already been made.
• Trying to change her mind about the breakup is like beating a dead horse; she has clearly moved on.
• We’ve already closed the case, but the detective insists on beating a dead horse with his persistent questions.
• Discussing the failed merger again is merely beating a dead horse; we need to focus on future opportunities.
• No need to beat a dead horse about the missed opportunity; let’s learn from it and move forward.
• Revisiting the same argument every day is just beating a dead horse; we need to find a resolution.
• Bringing up the old policy change in every meeting is like beating a dead horse; it's not going to be reversed.
• Continuing to complain about the weather is beating a dead horse; we can’t change it, so let’s adapt.
• Rehashing the past mistakes of the company is beating a dead horse; we should concentrate on our current goals.