The antonyms for the phrase "tying together" would be separating, disconnecting, dividing, disjoining, scattering, disbanding, disuniting, and isolating. When we use the phrase "tying together," we mean that we are connecting or linking two or more things to create a sense of unity. However, antonyms of tying together are something that goes against this sense of unity and brings a feeling of disconnection. For instance, when we disconnect or divide something, we intentionally cut off the connection that binds them, ultimately leading to a lack of unity. Similarly, when we disband or disunite, we nullify the connection to make them alone and isolated from one another.