to extend over and cover something

किसी चीज़ को ढकना

English Usage: The branches of the tree overarch the path.

Hindi Usage: पेड़ की डालियाँ पथ को ढकती हैं.

something that serves as a comprehensive or overarching concept

सर्वग्राही विचार

English Usage: The overarching theme of the conference was sustainability.

Hindi Usage: सम्मेलन का सर्वग्राही विषय स्थिरता थी.