the.com/work week

means The block of days, typically five, set aside for paid labor before the weekend arrives.

from A plain compound of 'work' and 'week,' with no hidden trickery in its roots — the phrase solidified in English as industrialized labor standardized the idea of a fixed number of working days, especially once the five-day, 40-hour pattern spread in the early-to-mid 20th century. The word itself doesn't predate the concept it names by much; language caught up to the clock and the calendar almost in step.