set out on
phrasal verb. B2 Upper Intermediate
phrasal verb. to start a journey, especially one that is long or difficult. You can also use it to mean starting a project with a specific goal in mind.
phrasal verb. to begin a journey or a project with a clear objective or destination in mind.
They set out on a long journey across the mountains.
The explorers set out on their expedition at dawn, hoping to reach the summit before the weather turned.
Having secured the necessary funding, the research team set out on a multi-year study to map the migration patterns of the endangered species.
Usage
The phrasal verb is intransitive and requires the preposition 'on' to introduce the journey or task.