crown

1 crown /ˈkraʊn/ noun
plural crowns
1 crown
/ˈkraʊn/
noun
plural crowns
Britannica Dictionary definition of CROWN
1 
[count]
a  : a decorative object that is shaped like a circle and worn on the head of a king or queen for special ceremonies
◊ Crowns are usually made of gold or silver and decorated with jewels.
b  : a similar object worn by someone who is not an actual king or queen
c  : a ring of leaves or flowers worn on the head of someone who has won a game, contest, or award
2 
the crown or the Crown : the government of a country that is officially ruled by a king or queen
3 
the crown : the position of power that a king or queen has
4 
[count] : something (such as a badge or decoration) in the shape of a king's or queen's crown
5 
[count] : the title or position held by the person who has won a particular competition : championship — usually singular
6 
[count] : the part of a tooth that can be seen
7 
[count] : the top of the head — usually singular
8 
[count] : the part of a hat that covers the top of the head — usually singular — see picture at hat
9 
[count] : the highest part of something (such as a tree or mountain)
10 
[count]
a  : a unit of money used in several European countries
b  : an old British coin worth five shillings

— crown

adjective, always used before a noun
2 crown /ˈkraʊn/ verb
crowns; crowned; crowning
2 crown
/ˈkraʊn/
verb
crowns; crowned; crowning
Britannica Dictionary definition of CROWN
[+ object]
1 
: to put a crown on (a new king, queen, etc.) : to give (someone) the power and title of a king or queen — usually used as (be) crowned
2 
: to officially or formally give (someone) the title or position of a champion, winner, etc.
3 
: to end (something) in a successful and impressive way
4 
literary : to be on top of (something) : to form the top of (something) — usually used as (be) crowned
5 
: to put an artificial crown on (a tooth)
6 
informal : to hit (someone) on the head

to crown it all

British
— used to indicate the last and usually worst thing in a series of bad things that have happened