multitude; many layers; crowds of people
Literally 'ten layers, twenty layers'; a set phrase emphasizing a great number or dense crowd, often used in literary or poetic contexts.
People surrounding them in layer upon layer.
The many layers of petals are beautiful.
A compound of 十重 (ten layers) and 二十重 (twenty layers), used as an emphatic set phrase to express a great multitude or many layers. The exact historical origin is uncertain.