内行

You can use it as a noun or an adjective. Usually, you'll say someone 'is' 内行. You can add 很 (hěn) to say they are 'very' expert. It’s common to say 一看就是内行. This means 'one look and I can tell you’re an expert.' It works for hobbies like coffee or photography. It also works for serious professional careers. It’s a versatile way to show respect.

Use it when you are impressed by someone’s expertise. At a tea shop, tell the owner they are 内行. In a business meeting, use it to praise a consultant. It’s perfect for networking. It makes you sound like you appreciate true craftsmanship. You can also use it to describe a 'pro' move. If someone picks the best wine, they are 内行.

Don't use it for basic life skills. Knowing how to boil water doesn't make you 内行. Avoid using it for purely academic knowledge. It usually implies practical, 'hands-on' experience. Also, don't use it to describe yourself too loudly. In Chinese culture, modesty is key. Let others call you 内行. If you say it about yourself, you might sound a bit arrogant.

In China, 'mianzi' (face) and respect for mastery are huge. Calling someone 内行 gives them a lot of 'face.' It acknowledges the years they spent practicing. Historically, trades were passed down in families. Being an 'insider' meant you held the family secrets. Today, it’s less about secrets and more about professional standards. It’s a bridge between traditional respect and modern professionalism.

The opposite is 外行 (wàiháng), meaning an amateur or outsider. If you are doing something poorly, you might joke: 'I am an 外行.' Another variation is 行家 (hángjiā). This is a slightly more formal way to say 'master.' You might also hear 内行人 (nèihángrén). This literally means 'an insider person.' All of these circle back to the idea of mastery.