n
1 fee paid to sb (esp a barrister) in advance for services as and when one may need them聘用定金（尤指预付给讼务律师的）
*[attrib 作定语] a retainer agreement 预付聘用费的协议.
2 reduced rent paid to reserve a flat, etc for one's use while one is absent from it （为外出期间保留租房等而付的）定金.3 (arch 古) servant, esp one who has been with a family or person for a long time 仆人（尤指服务多年的）
*(joc 谑) an old family retainer 老家仆.

n[C]
an amount of money paid to someone, especially a lawyer, so that they will continue to work for you in the future
BrE a reduced amount of rent that you pay for a room, flat etc when you are not there, so that it will still be available when you return
AmE a plastic and wire object that you wear in your mouth to make your teeth stay straight
British Equivalent: brace
old use a servant