You cannot delete your app from Google Play. Instead, you can unpublish an app and it will no longer appear in the store.

To unpublish your app on the Google Play store:

1. Go to https://market.android.com/publish/Home, and log in to your Google Play account. 
   
   
2. Click on the application you want to delete.
   
   
   
   
3. Click Unpublish.
   
   

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