The compound "week-to-week" is a modern English formation built entirely from native Germanic elements. Its core component, "week," originates from the Old English concept of a turning or succession, reflecting the cyclical nature of time. The preposition "to," used here in a serial sense, creates a pattern of direct progression from one unit to the next identical unit. This transparent compounding logic yields the modern sense of something measured, repeated, or evaluated in consecutive weekly intervals, emphasizing short-term continuity and immediacy rather than long-term planning.

Structure: week (period of seven days) + to (indicating progression) + week (period of seven days) - week: From Old English wice, wicu ("a turning, succession, change"), of Germanic origin. Functions as the core noun denoting a time period. - to: From Old English tō (preposition, adverb), of Germanic origin. Functions as a preposition linking the repeated instances. - week: (Repeated) Same as above, completing the compound structure.