This is the 1167th most frequent Dutch word.
vertrekken
"Vertrekken" means "to depart" or "to leave."
Here, 'vertrekken' is used in an intransitive sense to indicate departure or leaving a place.
Ik vertrek morgen naar Parijs.
I am leaving for Paris tomorrow.
In this sentence, 'vertrekken' describes the act of departing, in this case, referring to the airplane.
Het vliegtuig vertrok precies om acht uur.
The plane departed exactly at eight o'clock.
Here, 'vertrekken' illustrates a habitual action of leaving a place early.