Meaning of “shan't” - Learner’s Dictionary

shan't

us uk /ʃɑːnt/ mainly UK
Extra Examples
I shan't be going to the match, so you can have my ticket.I shan't be home until late, so don't wait up.I shan't be surprised if I fail these exams.I shan't expect you to attend unless I hear otherwise.I shan't be sorry when she's gone.

short for shall not:

I was invited to the party, but I shan't be going.

(Definition of “shan't” from the Cambridge Learner’s Dictionary © Cambridge University Press)