Meaning of “standing” - Learner’s Dictionary

standing

adjective [ always before noun ] uk us /ˈstændɪŋ/

permanent and not only created when necessary:

a standing committee
He has a standing invitation to stay at our house.
a standing joke

a situation that a group of people often make jokes about:

The poor quality of his work has become a standing joke in the office.
→ See also long-standing

(Definition of “standing adjective” from the Cambridge Learner’s Dictionary © Cambridge University Press)