1. forms an arch over something; spans or extends over
2. encompasses or includes as a dominant or unifying element

Examples

• The stone bridge overarches the narrow river.
• A canopy of trees overarches the walking path.
• The cathedral’s dome overarches the entire sanctuary.
• A single theme overarches all of her novels.
• The company’s mission statement overarches every department’s goals.
• His philosophy overarches both his personal and professional life.