打招呼

1. greet sb.; say hello

♦ 他俩见面不~, 仿佛谁也不认得谁。 The two of them never greet each other and behave as if they were strangers.

2. notify; let sb. know

♦ 你什么时候去开封, 给我打个招呼。 When you go to Kaifeng, please let me know.

3. warn; remind

♦ 事先已跟他们打过招呼了。 I've already warned them.