打招呼 dǎzhāohu notify
notify; greet; inform
How to remember 打招呼: 打 hit + 招 to summon + 呼 breathe = notify.
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How it is used
- To greet / say hello, or to give someone a heads-up - 跟他打招呼 (gēn tā dǎ zhāohu) say hi to him.
- A verb-object phrase (打 + 招呼), so it splits: 打了个招呼 gave a greeting.
- Second sense: 提前打个招呼 (tíqián dǎ ge zhāohu) = let someone know in advance, notify informally.