The english wikipedia is lacking on the historical side, but you can find out more with the French one : https://fr.wikipedia.org/wiki/Journalier

Google trad of a couple paragraphs :

> Most of the modest peasants, men or women, very often still small artisans, small weavers or textile workers, peddlers, boatmen or carriers in bad seasons, could become day laborers on nearby farms and estates, if they had the build and stamina, once their own work was done. Some were even regular day laborers, familiar to a domain steward or a village ploughman, present all year round or usually required for a certain number of tasks. Certain harvest tasks were sometimes carried out if possible part of the night, or continuously by successive teams[5].

> Day laborers, brewers or laborers, represented a significant part of the population and sometimes lived, in the absence of family support or a solidarity house, on the edge of begging[8]. In rural areas, they subsisted thanks to additional agricultural work with ploughmen or farm merchants but also thanks to wool spinning, crafts or transport. They also served as additional labor in construction, helped the lumberjacks, made bundles, etc. Women did laundry or took children in as wet nurses[9].