1. to swing back and forth in a regular rhythm
2. to vary or fluctuate between different states, conditions, or opinions

Examples

• The pendulum oscillates from side to side.
• The fan oscillates to cool the entire room.
• Stock prices oscillated wildly throughout the day.
• She oscillates between confidence and self-doubt.
• The temperature oscillates between hot and cold.
• His mood oscillates depending on the weather.
• The needle on the gauge oscillated rapidly.