There are many synonyms for the phrase "in privacy" that can be used to describe a situation where something is done away from the public eye. Some examples of alternative phrases that could be used include "in seclusion," "in secret," "out of sight," "behind closed doors," "in solitude," or "in private." Each of these phrases has a slightly different connotation and may be appropriate for different situations depending on the level of privacy required or the reason for keeping something hidden. Ultimately, the choice of which phrase to use will depend on the context of the situation and the intended tone of the message.