to depart for a destination
partir en direction de (partir en direction de)
"We’ll head off for the airport at 5 a.m."
"Nous partirons en direction de l'aéroport à 5 h du matin." (Nous partirons en direction de l'aéroport à 5 h du matin.)
said when someone appears just as you mention them
to become familiar with something new
someone new to a place or situation
I do not know the answer to a question
to find the real cause of a problem
to ensure that fairness or punishment is properly given