"Render up" is a phrase that is often used to refer to the act of giving someone a particular item or thing. There are several synonyms for this phrase that can be used to convey the same meaning. These include words like "surrender," "deliver," "provide," "yield," and "submit." Each of these words refers to the act of giving something to someone else, whether it is an object or a piece of information. Choosing the right synonym for "render up" will depend on the context of the sentence and the specific connotations that each of these words carries.