Sit down.
Meaning: This means to tell someone to find a place to sit and rest their body. It's like saying, Please find a chair or bench and rest your body on it with your legs bent and your feet on the ground.
Choice of Words: Sit means to rest your body on a chair, bench, or other surface with your legs bent and your feet on the ground. Down means to move to a lower position. When you put them together, "Sit down" is a simple instruction asking someone to find a place to sit and rest their body.
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