shan't
SHANT/ʃænt/UKSHAHNT/ʃɑːnt/
- 1Contraction of shall not. It is mostly British and sounds old-fashioned in American English.
I shan't be home until after dark.
We shan't tell anyone your secret.
Note
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Origin
A short way to say "shall not," made from "shall" plus "n't."