You can unpublish an app, when you do, 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 on the Store Presence menu, and click the "Pricing and Distribution" item.
4. Click Unpublish

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