x1 is work-heirarchy "uncle/aunt" of x2 via relation/partial ordering x3; x1 is either (in a narrow sense) a direct subordinate of the direct boss/superior/manager of x2's direct boss/superior/manager, or is (in a broader sense) an equal-level co-worker of x2's direct boss/superior/manager (no matter the exact relation).
This word is a brapagjvo from "treicu". See also: "jatny'utka".