Convert managed Entity into Unmanaged.

How to convert a managed Entity into an unmanaged one in MS CRM 2013?

I have an unused entity which was created  by mistake in Organisation Scope level  which was moved from source to target by mistake . We have this unused entity in a managed form in target . Is there any possible way to delete this managed entity ? 

Or 

Is it possible to convert managed into unmanaged in Target so as to enable removal .