下次吧。

You usually place it at the end of a sentence. You can also use it as a standalone reply. Adding the particle 吧 is crucial here. It softens the tone significantly. Without it, 下次 sounds like a cold command. With it, you sound like a friend who is genuinely busy. It is the verbal equivalent of a polite shrug and a smile.

Use it when a coworker invites you for spicy hotpot. Use it when a street vendor offers you a deal. It is perfect for texting friends when you're too tired. If someone asks for a favor you can't do, use this. It works beautifully at a restaurant when offered more dessert. It is the gold standard for staying polite while staying home.

Avoid using this if you actually want to go. People might take it as a polite "never." Do not use it in serious business negotiations. It can sound like you are stalling or being indecisive. Also, don't use it if a specific time was set. If you have a 2 PM meeting, don't say 下次吧. That just sounds like you are skipping work!

Chinese communication is often high-context and indirect. This is known as "saving face." By saying 下次吧, you give the other person an out. They know you are busy, and you know they know. It is a shared social dance. In some cities, like Shanghai, it is a very common polite brush-off. It keeps the social harmony intact without a messy confrontation.

You might hear 以后再说吧 which means "let's talk later." Another one is 改天吧, meaning "let's change the day." Both serve the same purpose as 下次吧. If you want to be extra polite, add 不好意思. Say 不好意思，下次吧. This adds a layer of sincere apology to your decline. It makes you sound like a true local.