Here are some examples:
* "S'il te plaît, baisse-toi pour ramasser le livre." (Please bend down to pick up the book.)
* "Elle s'est baissée pour passer sous la porte." (She bent down to go under the door.)
Here are some other options, depending on the context:
* "Se pencher" - This is used for bending over or leaning forward, more like "lean down."
* "S'agenouiller" - This is used for kneeling down.
* "Se mettre à genoux" - This is another way to say "kneel down."
The best way to choose the right phrase depends on the specific action you want to describe.