The word 'zig' originated in the early 20th century as a back-formation from the much older word 'zigzag', which entered English in the early 18th century from French. 'Zigzag' itself is likely of imitative origin, possibly echoing the sharp, jagged visual pattern it describes. The creation of 'zig' follows a common linguistic pattern where one half of a reduplicative compound is isolated to create a simpler, related term, mirroring the formation of 'zag' from the same source. Thus, 'zig' captures the essence of a single, abrupt turn within a series of alternating angles.

The word 'zig' is a simplex morpheme, a clipped back-formation from 'zigzag'. It does not have further segmentable parts within its modern English spelling.