関係を深める

This phrase is a classic 'noun + particle + verb' combo. You take 関係 (relationship), add the object marker を, and finish with 深める (to deepen). You can use it as a goal, like 関係を深めたい (I want to deepen the relationship). You can also use it to describe an action, like 食事をして関係を深めた (We deepened our relationship by having a meal). It is very flexible. You can use it for business, friendship, or even romance. Just remember that 深める is something you actively do. If the relationship deepens on its own, you would use 深まる instead.

Use this when you want to sound intentional about your connections. It is perfect for a business follow-up email after a successful meeting. It is also great for a toast at a wedding or a party. You might use it when talking to a mentor about your team. If you are texting a new friend and want to hang out more, this phrase shows you value them. It’s a 'warm' phrase that makes people feel appreciated. Use it whenever you feel a connection is moving to the next level.

Don't use this for people you just met ten seconds ago. If you tell a random person on the street you want to 関係を深める, they might call security! It sounds a bit too intense for a first 'hello.' Also, avoid using it for inanimate objects. You don't 'deepen a relationship' with your new toaster or your favorite pair of shoes. Keep it strictly for humans or organizations. Finally, if you are already best friends for 20 years, it might sound a bit formal. At that point, the relationship is already deep!

In Japan, relationships are the currency of life. There is a concept called 縁 (en), which refers to fate or the threads that connect people. Because Japan is a 'high-context' society, trust is often more important than a legal contract. This is why business people spend so much time at 飲み会 (drinking parties). They aren't just drinking; they are 関係を深める. Building a deep relationship is seen as a long-term investment. It requires patience, consistency, and many bowls of ramen.

If you want to sound a bit more casual with friends, use 仲を深める (naka o fukameru). 仲 refers to the personal 'closeness' between people. If you are at a very formal event, like a diplomatic gala, you might hear 親交を深める (shinko o fukameru). This is the 'black-tie' version of the phrase. You can also say 絆を深める (kizuna o fukameru) which means 'to deepen the bonds.' That one is very emotional and often used after a shared hardship or a big disaster.