1. The main or central idea that is not explicitly stated but runs through a work of literature, film, speech, or other composition
The underlying theme of the novel is the struggle between good and evil.
O tema subjacente do romance é a luta entre o bem e o mal.
2. A fundamental or implicit concept that supports or unifies various elements of a work
Freedom and justice are underlying themes in the activist's speeches.
Liberdade e justiça são temas subjacentes nos discursos do ativista.