ˈcasualizev. [as a back-formation] (transitive) to convert (regular employees) into casual labourers.
ΘΚΠ
society > occupation and work > business affairs > management methods or systems > adopt doctrines, methods, or management systems [verb (transitive)] > casualize or decasualize
decasualize1907
casualize1950
1950 Hansard Commons CDLXXVII. 825 The major reason..is the decision..to refrain from casualising the waiters and waitresses.