
verteidigen
to defend
To protect someone or something from an attack, danger, or criticism.
Die Soldaten verteidigten die Stadt gegen die Angreifer.
The soldiers defended the city against the attackers.
to defend
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to defend
To protect someone or something from an attack, danger, or criticism.
Die Soldaten verteidigten die Stadt gegen die Angreifer.
The soldiers defended the city against the attackers.

to defend oneself
To defend oneself against a physical or verbal attack.
Er musste sich gegen die falschen Anschuldigungen verteidigen.
He had to defend himself against the false accusations.

to defend
As a lawyer, to represent an accused person in court and present arguments for their innocence or for a lenient sentence.
Die berühmte Anwältin wird den Angeklagten vor Gericht verteidigen.
The famous lawyer will defend the accused in court.

to defend
To justify and support an opinion, a decision, or an academic work (e.g. a doctoral dissertation) with arguments.
Sie musste ihre These überzeugend vor dem Prüfungsausschuss verteidigen.
She had to defend her thesis convincingly before the examination committee.

to defend
In sports, to try to keep a title (e.g. world champion) or a lead and not lose it to a competitor.
Die Mannschaft will ihren Meistertitel in dieser Saison verteidigen.
The team wants to defend its championship title this season.
'Verteidigen' (to defend) is an inseparable verb. The prefix 'ver-' remains firmly attached to the verb 'teidigen' in all tenses and sentence constructions.
Er verteidigt seine Meinung mit starken Argumenten.
He defends his opinion with strong arguments.
'Verteidigen' (to defend) is very often used with the preposition 'gegen' (against) and the accusative to name the attack or danger. The pattern is: jemanden/etwas gegen jemanden/etwas verteidigen (to defend someone/something against someone/something).
Der Anwalt verteidigt seinen Mandanten gegen schwere Vorwürfe.
The lawyer defends his client against serious accusations.
When you defend yourself, the verb is used reflexively: 'sich verteidigen' (to defend oneself). When you protect another person or a thing, it is used without 'sich' (oneself).
Das Kind verteidigte seinen kleinen Bruder auf dem Schulhof.
The child defended his little brother in the schoolyard.
The object of the verb reveals the exact meaning: a title is defended in sports, a thesis in academia, an accused person in court, and a city in war.
Der Boxer will seinen Weltmeistertitel verteidigen.
The boxer wants to defend his world championship title.
In the meaning of 'rechtfertigen' (to justify), 'verteidigen' (to defend) is often combined with abstract nouns. Typical phrases are: eine Meinung verteidigen (to defend an opinion), eine Position verteidigen (to defend a position), eine Entscheidung verteidigen (to defend a decision), or eine Ehre verteidigen (to defend an honor).
Er verteidigte seine umstrittene Position bis zum Schluss.
He defended his controversial position until the end.
to represent
Vertreten generally describes a lawyer acting for a client and legally representing them. In this context, verteidigen is more specific and emphasizes defending against a charge and presenting arguments for the accused person. Use „vertreten“ for legal action in general and „verteidigen“ for defending someone in criminal proceedings.

Die Anwältin verteidigt den Angeklagten gegen die schwere Anklage.
The lawyer defends the defendant against the serious charge.
Die Anwältin vertritt den Angeklagten während des gesamten Verfahrens.
The lawyer represents the defendant throughout the entire proceedings.