There are several synonyms for the phrase "parting in two," depending on the context in which it's used. One common term is "splitting in half," which is often used to describe physical objects that break into two pieces. Another synonym is "dividing into two," which can apply to a separation or splitting of ideas or groups. "Bifurcating" is a more formal term that refers to a branching or dividing into two separate paths. "Fractionating" is a scientific term that describes the separation of a mixture into two or more components. Regardless of which synonym is used, all convey the concept of a separation or division into two parts.