Superstition: it is considered bad luck to whistle on or off stage, as someone (not always the whistler) will be fired.

迷信：在上或者下舞台的时候吹口哨是不吉利的，有人(不总是吹口哨的人)会被炒鱿鱼。

youdao

When the whistle goes, all the workers knock off for a cup of tea.

哨子一响所有工人都停下手里的活儿去喝茶。

youdao

I told him he might whistle me off, save himself, and I would say no word of blame.

我告诉他说，他可以随便让我离开，保住他自己，而我是一顺责怪的话也不会说。

youdao

Reddy used to take me and Anabel out on the sled, and sometimes other kids, too, and he had a special whistle that scared off bears.

NEWYORKER: Amundsen

The action continued right until the final whistle as Cole cleared off the line from United substitute Dimitar Berbatov after he was set up by Rooney.

BBC: eng-prem

Anderson was stretchered off at the final whistle after an innocuous looking challenge from Giles Barnes.

BBC: Man Utd trio suffer injury blow