The Collaborative International Dictionary
Shan't
Shan't \Shan't\ A contraction of shall not. [Colloq.]
Douglas Harper's Etymology Dictionary
shan't
by 1660s, "colloquial" [OED] contraction of shall not.
Wiktionary
shan't
contraction (context UK English) shall not
Usage examples of "shan't".
And I should have hoved at a well or a ford or something and made all true knights that came that way to joust with me for the honor of their ladies, and I should have spared them all after I had given them a great fall, and I should live out of doors all the year round in a pavilion and never do anything but joust and go on quests and bear away the prize at tournaments, and I shan't ever tell anybody my name.