défendre l' estimation

You use this phrase when you are in a position of expertise. It usually involves a verb like devoir (to have to) or réussir à (to succeed in). For example, "I had to défendre l'estimation during the meeting." It sounds active and professional. It shows you aren't just guessing; you have a solid plan. It is a great way to sound confident in a business setting.

This is your go-to phrase for professional negotiations. Use it when talking to your boss about a budget. Use it when a client asks for a discount you can't give. It also works in real estate or insurance contexts. If you are a student, you might use it when explaining a grade you think you deserved. It’s perfect for any moment where numbers and credibility collide.

Don't use this for casual guesses. If you're guessing how many jellybeans are in a jar, you don't "defend" that. It’s too heavy for a casual chat about the weather. Also, avoid it if you are actually wrong! Défendre implies there is a valid truth to protect. If you’re just being stubborn about a mistake, people might roll their eyes. Keep it for when you have the receipts to back it up.

In France, the art of negotiation is a national pastime. However, French business culture values logic and "le sérieux" (seriousness). You don't just throw out numbers; you build a case. Défendre l'estimation reflects this cultural need for intellectual rigor. It’s not just about the money; it’s about the logic behind the money. It shows you are a person of substance who respects the process.

You might hear justifier le devis (justify the quote) which is very similar. Another one is maintenir son chiffrage (maintain one's numbering/pricing). If you want to be more aggressive, you could say se battre pour son budget. But défendre l'estimation remains the most balanced and professional way to say you are standing firm.