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.
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 sacrifice
'opfern' and 'weihen' can both have to do with religion, devotion, or a higher goal. 'opfern' means that you voluntarily give up something valuable, for example time, money, or, in a religious ritual, an offering. 'weihen' is more about declaring something or someone holy in a ceremony or dedicating them to a special purpose. In a figurative sense, you can dedicate your life or energy to a task. Learners may confuse the words because both sound solemn and are connected with devotion. The practical difference is: with 'opfern', the focus is on loss; with 'weihen', it is on a special purpose or dedication.
Der alte Altar wurde in einer feierlichen Messe geweiht.
The old altar was consecrated in a solemn mass.
Für den kranken Nachbarn opfert Ali am Montag seinen freien Abend.
Ali sacrifices his free evening on Monday for his sick neighbor.