What is the origin of 'sleep tight'?
Read moreOne of the mysteries of the English language finally explained.
A person who has custody or guardianship of something or someone; a guardian, a custodian. Now chiefly Scottish Law: a person or party to whom goods are delivered for a particular purpose, such as cleaning or maintenance, and who is then responsible for them for the period that they are in his or her custody.
Early 16th century. From classical Latin custōdia custody + -er.