📒 a sum of money that is paid to somebody to make sure they will be available to do work when they are needed
📒 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
📒 a device that keeps a person’s teeth straight after they have had orthodontic treatment with braces
📒 a servant, especially one who has been with a family for a long time