This is the 16122nd most frequent Polish word.
udać
"Udać" means "to succeed" or "to pretend," depending on context.
Here, 'udać się' is used to mean 'to manage or succeed,' referring to successfully accomplishing something.
Udało mi się zdać egzamin.
I managed to pass the exam.
In this case, 'udać się' means 'to go or to head,' talking about moving toward a destination.
Postanowiliśmy udać się w podróż.
We decided to embark on a travel journey.
Here, 'udać się' is used in the negative form to show failure in achieving or completing an action.