Which word is used to indicate a position of rest?

The word "lie" is used to indicate a position of rest, as it refers to the act of reclining or being in a horizontal position. For example, when one says, "I will lie down," they are indicating that they intend to assume a resting position. This usage highlights the state of being in repose without the implication of placing something down, which is where the other words might diverge in meaning.

"Lay" typically requires a direct object and means to put something down. "Set" also denotes an action of placing an object in a particular position and usually involves a direct object as well. "Place," similar to "set," involves the action of putting something somewhere, and does not connote a state of rest or lying down. Therefore, "lie" is distinctly appropriate for expressing a position of rest.