This is the 3296th most frequent Russian word.
отправиться
To set off; to depart.
In this sentence, "отправиться" is used in the context of beginning a journey or trip.
Мы решили отправиться в путешествие по Европе.
We decided to embark on a journey across Europe.
Here, "отправиться" is used in the context of going to a specific location with a purpose.
Она собирается отправиться в магазин за продуктами.
She is planning to go to the store for groceries.
In this context, "отправиться" metaphorically refers to starting a new endeavor or phase in life.