How do you say put a ring on it in french?

There isn't a single, perfect translation for "put a ring on it" in French that captures the same informal, romantic, and suggestive tone. However, here are some options depending on the context:

Formal:

* Lui demander sa main: Literally "to ask for her hand", which implies a formal proposal.

* Lui faire sa demande en mariage: Literally "to make her a marriage proposal".

Informal & Romantic:

* La demander en mariage: Literally "to ask her to marry". This is a common and straightforward way to say it.

* Lui passer la bague au doigt: This literally means "to put the ring on her finger" and is a more playful way to say it.

* L'épouser: This means "to marry her" and is a simple and direct way to express the intention.

Slang/Funny:

* L'emmener à l'autel: Literally "to take her to the altar." This is a humorous and playful way to say it.

* La mettre en cage: This is a slangy way to say "to marry her", implying that you're trapping her.

The best way to say it will depend on the specific situation and the level of formality desired.