The antonyms for the phrase "out back" are indoor, front, exterior, and face. The opposite of being "out back" is to be inside or indoor, indicating a space within a building or structure. The front, exterior, or face of a property is also considered an antonym, referring to areas located towards the entrance or the front portion of a building. 'Out back' tends to be associated with remote, secluded, rustic, and natural environments. The antonyms, on the other hand, are related to a more public, formal, and urban setting. Overall, these antonyms offer a better understanding of the context and connotations of the phrase "out back.