This is the 410th most frequent Catalan word.
tancar
To close.
Here, "tancar" is used in its basic meaning, to physically close something.
Vaig tancar la porta abans de sortir.
I closed the door before leaving.
In this context, "tancar" is used figuratively to mean temporarily ceasing operations.
Tancarem el negoci per vacances.
We will close the business for holidays.
Here, "tancar" is used metaphorically to mean concluding or finalizing an abstract concept.