関係を深める

Grammatically, this is a very versatile 'Object + Particle + Verb' combo. You usually say [Person/Group] との関係を深める. For example, 同僚との関係を深める means 'to deepen relationships with colleagues.' You can also use it with abstract groups, like 地域社会との関係を深める (deepening ties with the local community). Just remember that 深める is something YOU do (transitive). If the relationship deepens on its own without a specific person pushing it, we use the intransitive version: 関係が深まる. Think of 深める as the shovel you use to dig the well, while 深まる is the well getting deeper because of the rain. Don't worry, even if you mix them up, people will still understand you, though they might think you're a bit more 'passive' than you intended!

In the modern world, this happens everywhere. Maybe you’ve been following someone on Instagram for a year, and you finally decide to send a DM to discuss a shared hobby—that’s a step toward 関係を深める. In the Japanese workplace, this often happens during 飲み会 (drinking parties), where the formal 'work mask' comes off and people talk about their families or hobbies. Or, if you're a gamer, moving from playing with random strangers to joining a specific Discord server to coordinate raids is a classic way to 関係を深める. Even Netflix can be a tool! Inviting someone over for a binge-watch session is a strategic move to move past the 'awkward silence' phase and into the 'sharing snacks and opinions' phase.

Use this phrase when you are talking about goals or intentions. It’s very common in New Year’s resolutions: 今年は家族との関係を深めたい (I want to deepen my relationship with my family this year). It’s also a 'gold star' phrase for job interviews. If you tell an interviewer that you want to 顧客との関係を深める (deepen relationships with clients), you sound professional, proactive, and like someone who actually cares about people rather than just numbers. It’s perfect for any situation where you want to emphasize growth, trust, and long-term commitment. It works for romance, friendship, business, and even your relationship with your pet (if you finally get that cat to stop biting your ankles).

Do not use this for one-off interactions or fleeting moments. You wouldn't 関係を深める with a cashier at 7-Eleven unless you're planning to marry them or join their secret underground cult. It’s also not suitable for physical objects. You can't 関係を深める with your pizza, even if you really, really love it. Also, avoid using it for negative connections. You wouldn't 'deepen a relationship' with an enemy unless you're in a very confusing movie plot. If the relationship is toxic or professional-only, stick to more neutral terms like 付き合う (to associate with) or 連絡を取り合う (to keep in touch).

One of the most frequent hiccups for learners is using the wrong adjective-verb form.

While 深くする technically means 'to make deep,' it sounds mechanical, like you're physically digging a hole in the ground. 深める is the dedicated 'nuance' verb for abstract things like feelings, relationships, and knowledge. Another mistake is forgetting the particle と.

Without と (with), it sounds like you are an outside observer deepening a relationship *between* two other friends. Unless you’re a professional matchmaker or a very busy meddler, you probably want to include yourself in the mix!

If you want to sound a bit more casual, you can use 仲良くなる (to become close). It’s the bread and butter of Japanese social life. For a more 'team-building' vibe, try 親睦を深める (shinboku o fukameru), which is often used for official events like company picnics or school trips. If you are talking about a romantic partner and want to sound a bit more 'poetic,' you might hear 絆を強める (kizuna o tsuyomeru), which means 'to strengthen the bond.' 関係を深める is the most balanced of these—not too stiff, not too casual, just right. It’s the 'Goldilocks' of relationship phrases.

You will often see 仲を深める (naka o fukameru) as a slightly more personal variation. While 関係 is broad and can be professional, 仲 specifically refers to the personal 'harmony' or 'friendship' between people. Use 仲を深める when talking about friends or siblings. In business settings, you’ll see 信頼関係を深める (shinrai kankei o fukameru), which adds the word 'trust' (信頼) to the mix. It’s like adding high-octane fuel to your sentence—it shows you mean business and that you're a person of integrity.

Is this used on dating apps? Absolutely. You might see someone's profile saying まずは友達から関係を深めたいです (I want to start as friends and deepen the relationship from there). It’s a very safe, polite way to say you're not looking for a one-night stand. Can I use it for my boss? Yes, but usually in the context of 'team harmony' or 'professional collaboration.' Is it too formal for texting? Not at all! It’s great for that 'sweet spot' when you want to show someone you value them without sounding overly clingy or weirdly robotic. Just use it naturally and watch your Japanese social circle grow deeper and wider!