i have upgrade my mac to high sierra 2 days back but i need my previous os x 10.9.5

Do you have a Time Machine backup to Restore to/from?

https://support.apple.com/guide/mac-help/revert-to-a-previous-macos-version-mh15216/mac

The short answer is no, without a full backup or clone you cannot. You can try to use the method to reinstall the original OS - that may work or not:

https://support.apple.com/en-us/HT204904

(use the method on right)

Earliest I've seen lately is10.11.6

https://support.apple.com/en-us/HT206886

https://itunes.apple.com/app/os-x-el-capitan/id1147835434?ls=1&mt=12

http://updates-http.cdn-apple.com/2019/cert/061-41424-20191024-218af9ec-cf50-4516-9011-228c78eda3d2/InstallMacOSX.dmg