at one's service


at one's service
{adv. phr.} 1. Ready to serve or help you; prepared to obey your wish or command; subject to your orders. * /He placed himself completely at the President's service./ * /"Now I am at your service," the dentist told the next patient./ 2. Available for your use; at your disposal. * /He put a car and chauffeur at the visitor's service./

Dictionary of American idioms. 2013.