English definition of “retainer”
retainer /rɪˈteɪ·nər/ n [C]
› an amount of money that you pay to someone in advance so that the person will work for you when needed: He was on a $150,000 retainer from Lloyd's of London. › A retainer is also a device that holds something in place. › A retainer that you wear in your mouth helps to straighten your teeth.