Meaning: This means to lower your body onto the chair and rest in a seated position.
Choice of Words: Sit down is a verb phrase that means to assume a seated position. Chair is a noun that refers to a piece of furniture designed for sitting on.
Alternative Expressions
Please take a seat on the chair.
Meaning: This sentence is a polite way of asking someone to sit down on the chair. It's like saying, "Would you mind sitting down on the chair?".
Choice of Words: The word "please" is used to make a request polite. "Take" means to pick up or move something. "A" is used to refer to one specific chair. "Seat" means the part of the chair where you sit. When you put these words together, "please take a seat on the chair" means to ask someone to move their body to the chair and rest their bottom on it.