What is Crown ?
Crown is (noun) 1. a jewelled metal headdress for an emperor, king or queen The archbishop placed the crown on the head of the young king. The queen received the ambassadors wearing a heavy gold crown. 2. (in Britain) the king or queen representing the state In England, all swans belong to the crown. The Crown Jewels are kept in the Tower of London. counsel for the Crown a lawyer representing the state in a trial 3. a false top attached to a broken tooth I’m going to the dentist to have a crown fitted.(verb) 1. to make someone king or queen by placing a crown on his or her head The Queen was crowned in Westminster Abbey. 2. to be a splendid or dreadful end to something To crown it all, he won the lottery. To crown it all, the car caught fire on the level crossing. 3. to attach a false top to a broken tooth The dentist said that the tooth was so badly broken that he would have to crown it instead of trying to fill it.
source: Easier English, Student Dictionary Upper Intermediate Level