numero uno

From either (deprecated template usage) [etyl] Italian or (deprecated template usage) [etyl] Spanish, meaning “number one”

numero uno (plural numero unos)

1. (informal) The most important of a group.
2. (informal) Oneself, especially one’s own interests.

   In his business ventures, he always looks after numero uno.

numero uno m

1. The first in a series, or the most important in a group

• nemico pubblico numero uno