to be at the core.

The Italian word 'nucleo' refers to the central or most important part of something, similar to how 'core' is used in English. It can denote the innermost section of an object, such as the core of an apple, or it can refer to the fundamental essence of a concept, idea, or system. In various contexts, 'nucleo' can also be used to describe the central part of a cell in biology or the heart of a matter in discussions.