台Taivo A Taiwan Mandarin dictionary

棒打鴛鴦

bàngdǎyuānyāng

ㄅㄤˋ ㄉㄚˇ ㄩㄢㄧㄤ

Simplified 棒打鸳鸯

1(idiom) to cruelly separate lovers (esp. by family or societal pressure); to forcibly break up a couple against their will

Keep 棒打鴛鴦 and it comes back until you know it.