The phrase "keep apart" refers to the act of separating or distancing two things or people from each other. The antonyms for "keep apart" include terms such as bring together, combine, join, and unify, which indicate a bringing closer or merging of separate entities. To "bring together" means to bring closer, while "combine" refers to the act of mixing two or more things. "Join" implies physically connecting two pieces together, and "unify" means to bring together different parts to create a single whole. Overall, these antonyms are used to describe a reconciliation or bringing together of previously separated things.