Contracting 〜る＋な to 〜んな
Grammar: Colloquial and Casual Speech
A verb ending in 〜る followed by the particle な may contract as 〜んな.
Examples
Don't worry with すんな
Takeo takes his pregnant mother to the hospital, as she’s getting close to delivery. Once there, she gives Takeo and his friend Suna a list of things to take care of during her stay.
- 母さん:
- 「大丈夫から心配すんな」
- “I'll be fine, so don't worry.”
する＋な is contracted here to すんな.