zero-hours contract
noun [ C ] UK uk/ˌzɪə.rəʊ.aʊəz ˈkɒn.trækt/ us/ˌzɪr.oʊ.aʊrz ˈkɑːn.trækt/ (also zero-hour contract)
零工时合同（雇主可自由改变雇员工作时间甚至无须保证有任何工作时间的合同）
an agreement under which an employer can change the number of hours worked by an employee, and does not have to offer any hours
Thousands of workers in the UK are on zero-hours contracts. 在英国，成千上万的工人签的是零工时合同。