meal ticket  
noun uk/ˈmɪəl ˌtɪk.ɪt/ us/ˈmɪəl ˌtɪk.ɪt/
  (FOOD)     
  [ C ] US午餐券,午餐票 
a type of ticket that you can exchange for a meal
 Compare: luncheon voucher
  (MONEY)      
 [ C usually singular ]定期提供钱款的人;赖以赚钱的事物 
someone or something that you use as a way of getting regular amounts of money
  Gone are the days when a university degree was a meal ticket for life. 大学文凭就是一张终生饭票的日子一去不复返了。