1. moving back and forth in a regular rhythm
2. changing repeatedly between different states, conditions, or opinions

Examples

• The oscillating fan kept the room cool by moving air back and forth.
• She watched the oscillating pendulum of the grandfather clock.
• The oscillating sprinkler watered the entire lawn evenly.
• His oscillating moods made it difficult to predict his reactions.
• The stock market showed oscillating patterns throughout the week.
• The oscillating voltage caused problems with the electrical equipment.