metropolis; big city
Refers to a very large, bustling city, often with a connotation of modernity and scale. Commonly used for cities like Tokyo, New York, or London.
Tokyo is one of the world's great metropolises.
He moved from the countryside to the big city.
Compound of 大 (だい, 'big') + 都会 (とかい, 'city'). The reading is on'yomi, and the word is a straightforward Sino-Japanese formation.