This is the 13646th most frequent Spanish word.
retornarán
"They will return."
In this sentence, 'retornarán' is used in the future tense to indicate an action (returning) that will happen in the future.
Los pájaros retornarán en la primavera.
The birds will return in the spring.
Here, 'retornarán' conveys a future action, specifically tied to a conditional clause suggesting the timing of their return.
Cuando el sol se ponga, retornarán a sus hogares.
When the sun sets, they will return to their homes.
In this context, 'retornarán' is metaphorically applied to signify that issues will come back in a future time, extending its usage beyond physical returning to abstract concepts.