Located down a slope or hill. / Going down a slope or a hill. / (by extension) Easy.

(uncountable) The fastest of the disciplines of alpine skiing. / (countable) A rapid descent of a hill in related sports, especially in alpine skiing.

To take part in downhill skiing.

(slang) A negative drug trip. / (slang) A drug that has depressant qualities. / (slang) Something or someone disagreeable, dispiriting or depressing; a killjoy. / A livestock animal that has collapsed.

(UK, slang, obsolete) A sixpence.

Towards a lower place; towards what is below. / Towards something which is lower in order, smaller, inferior, etc.

Further along in the flow of current, in relation to a river, stream, bloodstream, or other flow of fluid. / (computer networking) In the direction from the server to the client.

Following the path of a river or stream

To stream downward.

A series of thoughts or actions which feeds back into itself, causing a situation to become progressively worse. It is worse than a vicious circle, which is self-sustaining in its current state.