Wait tables
Definition 1 of 1
Pro Tip 1/3Occupational Context
Used mainly to describe a job in the food service industry, so it's not applicable outside this sector. 
After her acting class, Mia goes to wait tables at a jazz club.
Pro Tip 2/3Casual Expression
'Wait tables' is casual and often used in everyday conversation, not typically in formal writing. 
I have to wait tables this weekend, so I can't join the camping trip.
Pro Tip 3/3Economic Implication
It can imply a temporary or secondary job, often to support oneself financially through school or other endeavors. 
He waits tables at night to fund his startup business.