a sum of money that is paid to somebody to make sure they will be available to do work when they are needed (聘请律师等的)预付费用,保留金 - (British English)
a small amount of rent that you pay for a room, etc. when you are not there in order to keep it available for your use (为保留租房而付的)租房订金 Check whether full rent or a retainer is required during vacations. 检查假期是否需要全额租金或押金。
- (North American English)
a device that keeps a person’s teeth straight after they have had orthodontic treatment with braces (牙齿)固位体,保持器 - (old-fashioned)
a servant, especially one who has been with a family for a long time (尤指服务多年的)仆人,家仆