whistle for

1. 徒劳地希望

I owe my butcher $10, but he can whistle for it.

我欠肉店老板十美元, 可是他别指望我会还。

whistle up

1. 勉强拼凑出

He had to whistle up some new ideas for lessons.

他只好勉强给上课的教材添些新内容。

blow the whistle on

1. 使……停下来

If your father finds out about this, he'll soon blow the whistle on what you're doing.

要是你父亲知道了这事, 他一定会马上阻止你去做下去的。

wet one's whistle

1. 喝酒

He likes to wet his whistle on the way home from work in the evening.

他喜欢在晚上下班回家的路上喝点酒。