That's another brilliant idea down the pan.

又一个好主意玩儿完了！

《牛津词典》

This soap has gone down the pan.

这个肥皂已经用不了了。

youdao

"Financial worries and austerity changes in diet cause intestinal disorders," he says, and sales of suppositories therefore rise as the economy goes down the pan.

“财务焦虑和饮食缩减会引起肠失调，”他说，于是当经济跌入低谷，栓剂销量便会上涨。

youdao

Their money wouldn't be down the pan: they owe only for value that they have had.

ECONOMIST: PFI

It automatically turns the heat down to a simmer temperature once the pan begins to boil.

CNN: Sensor keeps cooking on the boil

When cooking the fish skin-side down, be sure to coat the pan completely with oil, and to watch the fillet closely.

WSJ: Tyson Cole's Branzino With Herbs, Tomatoes and Thai Chilies | Slow Food Fast