krönen
to crown
To place a crown on someone in a ceremonial act and thereby make him or her king or queen.
Im Jahr 800 wurde Karl der Große zum Kaiser gekrönt.
In the year 800, Charlemagne was crowned emperor.

to crown
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to crown
To place a crown on someone in a ceremonial act and thereby make him or her king or queen.
Im Jahr 800 wurde Karl der Große zum Kaiser gekrönt.
In the year 800, Charlemagne was crowned emperor.

The verb 'krönen' (to crown) derives directly from the noun 'die Krone' (the crown). All meanings, including the figurative ones, relate to the idea of placing something at the top or giving it a special distinction.
Der König trug eine goldene Krone.
The king wore a golden crown.
You can recognize the meaning of 'krönen' (to crown) from the object. If a person is crowned, it refers to the ceremony. If an abstract concept (success, career) is crowned, it is the high point. If a dish is crowned, it refers to the garnish.
Man krönte den Prinzen zum neuen König.
They crowned the prince the new king.
In the literal meaning, the construction 'jemanden (accusative) zu etwas (dative) krönen' (to crown someone as something) is used to name the person's new title.
Die Kirche krönte ihn zum Kaiser.
The church crowned him emperor.
In the figurative meaning, 'krönen' (to crown) is often used with abstract nouns such as 'der Erfolg' (success), 'die Karriere' (career), 'der Abend' (evening), or 'das Werk' (work).
Ein gemeinsames Abendessen krönte den erfolgreichen Tag.
A shared dinner crowned the successful day.
to lock / to complete
'abschließen' and 'krönen' can both have to do with the end of something. 'abschließen' means, more neutrally, that an activity, project, or course of education is brought to an end. 'krönen' sounds more special: it means that something forms the successful highlight or especially beautiful conclusion. Learners may confuse the words because both can stand at the end of something. As a guide: you complete a piece of work, but a special success can crown that work.

Ein gemeinsames Essen krönt den erfolgreichen Projekttag.
A meal together crowns the successful project day.
Herr Hoffmann schließt die Reiseplanung heute im Gespräch mit dem Team ab.
Mr. Hoffmann completes the travel planning today in a discussion with the team.