
verweigern
to refuse
To refuse to carry out a required or expected action.
Der Angeklagte verweigerte die Aussage vor Gericht.
The defendant refused to give testimony in court.
to refuse
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to refuse
To refuse to carry out a required or expected action.
Der Angeklagte verweigerte die Aussage vor Gericht.
The defendant refused to give testimony in court.

to deny
To not give or grant someone something they have requested or might have a right to claim.
Die Versicherung verweigerte die Zahlung, da der Schaden selbst verschuldet war.
The insurance company denied the payment because the damage was self-inflicted.

to refuse to engage
To consciously withdraw from a situation, requirement, or social expectation and not participate.
Der Teenager verweigerte sich dem Gespräch mit seinen Eltern und zog sich in sein Zimmer zurück.
The teenager refused to engage in the conversation with his parents and withdrew to his room.

to refuse military service
To reject the legal obligation to perform military service for reasons of conscience.
Er hat aus pazifistischer Überzeugung den Kriegsdienst verweigert und stattdessen Zivildienst geleistet.
He refused military service because of his pacifist beliefs and performed civilian service instead.
'Verweigern' (to refuse) is an inseparable verb. The prefix 'ver-' remains firmly attached to the verb stem in all tenses and sentence constructions.
Er hat die Annahme des Pakets verweigert.
He refused to accept the package.
This verb can have two objects. The person to whom something is refused is in the dative. The thing that is refused is in the accusative. The pattern is: jemandem (dative) etwas (accusative) verweigern — to refuse someone something.
Der Türsteher verweigerte uns den Eintritt.
The bouncer refused us entry.
When someone does not want to carry out an action, 'verweigern' is often combined with nouns that describe a duty or expected action: 'die Aussage verweigern' (to refuse to testify), 'die Mitarbeit verweigern' (to refuse to cooperate), 'den Befehl verweigern' (to refuse an order).
Der Zeuge darf die Aussage verweigern, um sich nicht selbst zu belasten.
The witness may refuse to testify in order not to incriminate himself.
The reflexive form 'sich verweigern' means that someone consciously withdraws from a situation or expectation. It is often followed by a dative object indicating whom or what one is withdrawing from.
Er verweigert sich jeder Diskussion über seine Zukunft.
He refuses to engage in any discussion about his future.
The expression 'den Kriegsdienst verweigern' (to refuse military service) is a fixed phrase. It describes the legal option of not participating in military service for reasons of conscience. A person who does this is a 'Kriegsdienstverweigerer' (conscientious objector).
In Deutschland kann man den Kriegsdienst verweigern und stattdessen einen Zivildienst leisten.
In Germany, one can refuse military service and perform civilian service instead.
to reject
Both verbs can express a negative response to a request. Ablehnen is usually directed at the request, offer, or suggestion itself; verweigern emphasizes instead that someone does not give what was requested. Use ablehnen for the matter being rejected and verweigern for withholding something.

Der Verein verweigerte der Familie die finanzielle Hilfe.
The organization denied the family financial assistance.
Der Verein lehnte die Bitte um finanzielle Hilfe ab.
The organization rejected the request for financial assistance.