Phrasal Verb: Wait on

Meaning: Serve people in a restaurant

Example: They have two people WAITING ON each table.

Meaning: Sell goods in a shop

Example: He WAITS ON customers in an electronics store.

Meaning: Provide someone with everything they need or want

Example: He has a butler who WAITS ON him.

Meaning: Wait for a result before being able to make a decision

Example: They're WAITING ON the results of the vote before taking a final decision.