at (one's) service(redirected from at their service)
at (one's) service
Available to help or serve one. Here I am, resident file clerk at your service! How can help with this project?
at your service
1. Available to help you with whatever you need. It is a set phrase. One math tutor, at your service! I'm totally at your service—just tell me what you need me to do.
2. Said upon meeting someone for the first time as a polite way of identifying oneself. A: "Is there a John Jones here?" B: "At your service, sir."
at someone's service
Fig. ready to help someone in any way. The count greeted me warmly and said, "Welcome to my home. Just let me know what you need. I'm at your service." The desk clerk said, "Good morning, madam. I'm at your service."
at (someone's) service
Ready to help or be of use.