买单！

Simply raise your hand slightly to catch the server's eye. Say 买单！ with a friendly smile. In many casual Chinese spots, you can shout it out. Don't be shy! You can also add 请 (qǐng) at the beginning to be extra polite. 请买单 sounds a bit more polished.

Use it at any restaurant, cafe, or bar. It works perfectly when you are finishing your noodles. It is great when you are in a rush to catch a movie. You can even use it when texting a friend to say you'll treat them. 'Tonight, I 买单!' is a sentence that makes everyone happy.

Avoid using it in very high-end, fine-dining establishments. In those places, a quieter approach is better. Don't use it if you are a guest at someone's home. That would be quite awkward! Also, don't scream it across a silent, romantic candlelit room. Read the room first.

The phrase actually originated from Cantonese 埋单 (maai daan). Over time, the 'mai' sound shifted to the Mandarin word for 'buy.' In Chinese culture, people often fight over who gets to 买单. It is a sign of generosity and respect. Being the one to 买单 can be a major 'power move' among friends.

You might hear 结账 (jiézhàng) in northern China or more formal settings. It means 'settle the account.' Some people just make a 'writing' gesture in the air. If you want to be very casual, just say 老板，买单！ (Boss, check!). It makes you sound like a local regular.