UH' The term 'UH COUSINS' is a crossword solution that consists of three letters, 'ERS'. This acronym stands for 'Emergency Response Services', which is a term used to describe the various organizations and personnel that provide emergency assistance in times of crisis. These services can include firefighting, medical care, search and rescue, and other forms of emergency response. Emergency Response Services are typically provided by government agencies, such as police departments, fire departments, and emergency medical services, as well as private organizations and volunteers.