masses

US /ˈmæs·ɪz/
1.

khối lượng

a coherent, typically large body of matter with no definite shape.

:
a mass of curly hair
2.

khối lượng

a large number of people or objects crowded together.

:
a mass of cyclists
1.

khối lượng

assemble or cause to assemble into a mass or as one body.

:
both countries began massing troops in the region