to assure
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to assure
To firmly and bindingly promise or guarantee something to someone. It expresses a higher degree of reliability than a simple promise.
Der Händler sicherte mir zu, dass das Ersatzteil innerhalb einer Woche geliefert wird.
The dealer assured me that the replacement part would be delivered within a week.
'Zusichern' (to assure) is a separable verb. The prefix 'zu-' stands at the end in main clauses, while in subordinate clauses and in the infinitive it remains attached to the verb.
Der Verkäufer sicherte mir einen Rabatt zu.
The salesperson assured me of a discount.
The verb 'zusichern' (to assure) requires a person in the dative (to whom something is assured) and a thing in the accusative (what is assured). The structure is therefore: subject + zusichern + dative object + accusative object.
Ich sichere Ihnen meine volle Diskretion zu.
I assure you of my full discretion.
Instead of an accusative object, 'zusichern' (to assure) can also be followed by a subordinate clause with 'dass' (that) or an infinitive construction with 'zu' (to). The person remains in the dative.
Sie sicherte mir zu, dass sie sich um alles kümmern wird.
She assured me that she would take care of everything.
'Zusichern' (to assure) is often used in formal, business, or legal contexts. It expresses a strong, binding promise or guarantee.
Die Regierung sicherte den Bürgern schnelle Hilfe zu.
The government assured citizens of quick help.
to oblige / commit
'verpflichten' and 'zusichern' can both have to do with a binding promise. 'zusichern' is used when someone firmly promises or guarantees something to another person. The focus is on giving security to the other person. 'sich verpflichten' means that you yourself take on a task or responsibility and are bound to it. Learners may confuse the words because both sound more serious than a simple 'versprechen' (to promise). Remember: you assure someone of something ('jemandem etwas zusichern'), but you commit yourself to something ('sich zu etwas verpflichten').
Leon hat dem Team seine Unterstützung für das Projekt zugesichert.
Leon assured the team of his support for the project.
Wir haben uns verpflichtet, den Bericht bis Freitag fertigzustellen.
We committed ourselves to finishing the report by Friday.