The Curious Dreamer’s Dream Dictionary

by Nancy Wagaman
Obstacle, challenge, or threat.

A moving or rolling boulder might represent momentum, critical mass, overwhelm, or the idea of being out of control.

Consider also the context of the boulder and how you felt about it.

See Stone, Hard Object, Big, Blockage or Obstacle

New American Dream Dictionary

by Joan Seaman - Tom Philbin
1. Strength and power.

2. Obstacles.

3. Severe, seemingly insurmountable difficulties are in the offing.

The Complete Guide to Interpreting Your Dreams

by Stearn Robinson - Tom Corbett
See Rock(s).