stone; jewel; precious stone; flint (in a lighter); stone (in go); stone (in the bladder, kidney etc.); calculus
flow (of a fluid or gas); stream; flow (of people, things); passage (of time); course (of events); (step-by-step) procedure; group of people who remain together after the end of an event
to sink; to go under; to go down (e.g. sun); to set; to feel depressed; to become subdued