1) the other one. 2) the only, sole. 3) gcig shos is sometimes used in pairs, e.g.,, in Patrul's commentary to Mipham's nges shes sgron me (26.4-6): dgag bya bden grub la sogs pa gcig shos khegs pas chos can ka ba la sogs pa gcig shos kyang khegs par 'gyur te, ("...by negating the one, the truly established object of negation and so forth, the other, [conventional] phenomenon, such as pot, is also negated"). Here, the gcig shos... gcig shos... construction functions much like "the one ... the other..." in English
the other, companion, fellow-voyager