[have] a seat
1
to sit down, often in a chair or on a suitable surface
- She invited her guests to have a seat in the living room.
- The waiter asked the customers to have a seat while waiting for their turn to be served.
- She told her students to have a seat and be ready for the class to begin.
- We're having a seat at the park while we wait for our friends.
- The receptionist asked the client to have a seat and wait for his appointment.