retainer

retainer
noun

a thing that holds something in place
护圈；定位器
a guitar string retainer.
吉他弦定位器。
■an appliance for keeping a loose tooth or orthodontic prosthesis in place
（固定松动牙齿或矫正牙齿用）固位体
a fee paid in advance to someone, especially a barrister, in order to secure or keep their services when required
（尤指付给律师）聘用定金
■(Brit.)a reduced rent paid to retain accommodation during a period of non-occupancy
(英)（为保留租房不住而付的）定金
a servant or follower of a noble or wealthy person, especially one that has worked for a person or family for a long time
（尤指服务多年的）仆人，随从；门客

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