to fall; to drop; to go down; (of the sun or moon) to set; (of a tide) to go out; to decline; to sink

deep hole dug in the ground to obtain water, oil, or gas; also describes things shaped like a well shaft such as a skylight or mine shaft

to put something into a container; to add ingredients into boiling water; to apply effort or use force; to cast a net

rock; stone; (bound form) made of stone; rock-like