Beating a dead horse
djuːɪfɔː sɪθɹiː maθɹiː ts.hou5 daθɹiː djuːɪfɔː sɪθɹiːmɐθɹiː tʃəwɒnjuːdɐθɹiː
In Chinese 对死马抽打 (duì sǐmǎ chōudǎ)
This idiom is a direct translation, emphasizing the futility of continuing an action.
Example
"再争论下去也没意义了，就像对死马抽打一样。(Zài zhēnglùn xiàqù yě méi yìyì le, jiù xiàng duì sǐmǎ chōudǎ yīyàng.)"
