- A down is a hill. See mountain and dune.
- Down is the negative direction along the z-axis. Up and down are the only two well-defined directions in the presence of gravity. Earlier this was adown, meaning "from the hill".
- County Down is a county in Northern Ireland.
- Down is the fine undercoat of birds under the feathers, and is often used as insulation in clothing. Mammals have an undercoat called downhair.
- Down, used in American football, is a stage of play; four downs are allowed in a "possession"; three downs are allowed in Canadian football. The reference is to the ball or ball carrier being brought to a halt, often by being knocked down.
- Down is a colloquial synonym for depressed or blue.
- A computer (or other) system can go down when it essentially loses power or crashes.
- There is a heavy metal band named Down