to crown it all Definition

crown
noun

1. The circular, usually jewelled, gold headdress of a sovereign.
2a. The sovereign as head of state;

Thesaurus: royalty, monarch, sovereign, queen, king, potentate, emperor.
Form: the Crown
2b. The authority or jurisdiction of a sovereign or of the government representing a sovereign.

Form: the Crown
3. A wreath for the head or other honour, awarded for victory or success.
4. A highest point of achievement; a summit or climax.

Example: the crown of one's career
5. The top, especially of something rounded.

Thesaurus: top, apex, summit, crest.
6a. The part of a tooth projecting from the gum;
6b. An artificial replacement for this.
7. A representation of a royal crown used as an emblem, symbol, etc.
8. An old British coin worth 25 pence (formerly 5 shillings).
9. The junction of the root and stem of a plant.
10. A UK paper size, 385 ′ 505 mm.

verb crowned, crowning

1. To place a crown ceremonially on the head of someone, thus making them a monarch.
2. To be on or round the top of someone or something.
3. To reward; to make complete or perfect.

Example: efforts crowned with success
Thesaurus: perfect, fulfil, consummate, cap, complete, finish, terminate.
4. To put an artificial crown on (a tooth).
5. colloq
To hit on the head.
6. draughts.
To give (a piece) the status of king, by placing another piece on top of it.

Idiom: to crown it all

colloq
As the finishing touch to a series of especially unfortunate events.

Etymology: 11c: from French coroune, from Latin corona wreath or crown.