The Curious Dreamer’s Dream Dictionary

by Nancy Wagaman
Skiing or other winter downhill activity can represent: Making quick or smooth progress, perhaps due to external circumstances or risk-taking.

Also consider the context.

A pleasant downhill experience could represent fun, relaxation, or conquering a challenge (or a desire for such).

An out-of-control experience could represent a feeling or fear of losing control in a particular area of your life.

See Sliding, Descending, Competition, Snow, Cold, Winter, Hill

Strangest Dream Explanations

by Dream Explanations - Anonymous
Dreams of skiing signify freedom, adventure, joy, becoming unified with nature, and that you are moving boldly with velocity through the ups and downs of your life with mastery. This dream also signifies skillfulness in coping with frozen emotions.

Ariadne's Book of Dream

by Ariadne Green
Downhill skiing may mention that you are successfully exercising control over your fears. Skiing down the north face of a mountain represents moving through your greatest fears with ease.