when i say kosa ( with sh ) sound is it mean corner or something connected with the verb kosmak( with sh) sound ??

which mean to run

The word for corner is köşe, but koşa is not a word commonly used. In movies about Turkish history, koşa can mean that you want someone else to run in an authoritative way.

Or maybe you meant 'koşa koşa', it means '(by) running'. This is a clause commonly used in Turkish. When you add a suffix -e at the end of a verb and repeat it twice, it gives the meaning 'by doing that verb'.