tenir la route

You use it just like a regular verb. The subject is usually the thing being judged. You can say Ton idée tient la route (Your idea holds water). It is very common in professional and personal life. You can also use it in the negative. If someone tells a lie that is obvious, you say Ça ne tient pas la route. It is a great way to sound like a native speaker. It shows you are looking for logic and quality.

Use it when you are evaluating something. It works perfectly during a meeting at work. Use it when a friend explains a new theory. It is great for reviewing a movie plot. If the ending was logical, it tient la route. Use it when you want to give a compliment. It tells someone their work is solid and well-thought-out. It is a very versatile and positive expression.

Do not use it to describe people's physical health. It is not about a person standing up. Do not use it for very formal legal documents. It is a bit too colorful for a court of law. Avoid using it for simple facts. You would not say The sky is blue tient la route. It is for things that require a bit of reasoning. Don't confuse it with driving instructions either!

This phrase comes from the automotive world. France has a deep love for engineering and cars. A car with good 'tenue de route' (handling) is respected. Over time, this mechanical reliability became a metaphor for intellectual reliability. It reflects the French value of 'Cartesian' logic. If something is logical, it is beautiful. It became popular as cars became a central part of daily life.

You might hear tenir debout, which means 'to stand upright'. Both imply that an argument is strong. You can also say c'est du solide for something physical. In slang, people might just say ça passe. But tenir la route remains the gold standard for logic. It sounds smart without being stuck-up. It is the perfect middle-ground expression for any conversation.