to consecrate / dedicate
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to consecrate
In a religious or ceremonial act, to declare something or someone holy or dedicate them to a divine purpose. This often concerns churches, altars, or people taking up a religious office.
Der Bischof wird die neue Kapelle am Sonntag weihen.
The bishop will consecrate the new chapel on Sunday.
to dedicate to
In a figurative sense, to dedicate one's life, time, or energy to a particular task, person, or idea.
Sie hat ihr ganzes Leben der Erforschung seltener Krankheiten geweiht.
She dedicated her whole life to researching rare diseases.
The verb 'weihen' (to consecrate/dedicate) is a very formal and elevated word. It is used almost exclusively in solemn, religious, or very poetic contexts.
Mit einer feierlichen Zeremonie wurde das Denkmal geweiht.
The monument was consecrated in a solemn ceremony.
The context makes the meaning clear: if it is about religion, a ceremony, a church, or a priest, the literal meaning 'heiligen' (to sanctify/consecrate) is meant. If it is about life, time, or energy for an idea, the figurative meaning 'widmen' (to dedicate) is meant.
Der Priester weihte das Wasser.
The priest consecrated the water.
In the religious or ceremonial meaning, what is being consecrated is always in the accusative. The structure is: someone consecrates something.
Der Bürgermeister weihte die neue Brücke feierlich.
The mayor ceremonially dedicated the new bridge.
In the figurative meaning 'widmen' (to dedicate), a dative construction is always used. The structure is: someone dedicates to something (dative) their life/their time (accusative).
Die Forscherin hat ihr gesamtes Schaffen der Wissenschaft geweiht.
The researcher dedicated her entire body of work to science.
to dedicate / devote
Both widmen and weihen can express giving a great deal of time or energy to something. Widmen refers generally to consciously engaging with something intensively. Weihen sounds much more solemn and can express complete or lifelong dedication.
Sie weiht ihr ganzes Leben der Hilfe für kranke Menschen.
She dedicates her entire life to helping sick people.
Sie widmet viele Jahre der Hilfe für kranke Menschen.
She devotes many years to helping sick people.
