Swith means 'quickly' or 'immediately'.
Swith is an old word that is not used much anymore, but it can make people think of old stories or of people who talk in a special way.
Examples:
Swith, go and get me some water.
She swith ran to the store.
He swith finished his work.
Swith, clean up your room!
I need to leave swith, or I'll be late.
Swith, the dragon is coming!