to confuse / unsettle
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not to be deterred
Not to let oneself be turned away from one's path, opinion, or goal, even though there are obstacles or differing opinions.
Trotz der vielen Kritik ließ sie sich nicht beirren und verfolgte ihren Plan weiter.
Despite all the criticism, she was not deterred and continued to pursue her plan.
'Beirren' (to confuse/unsettle) comes from the verb 'irren' (to be mistaken, to wander around). The inseparable prefix 'be-' turns it into a transitive verb: to lead someone astray or confuse them.
Die widersprüchlichen Informationen beirrten die Ermittler.
The contradictory information confused the investigators.
This verb is used almost exclusively in the fixed, negated expression 'sich nicht beirren lassen' (not to be deterred). This construction with the reflexive pronoun 'sich' and 'lassen' is very important.
Er ließ sich nicht beirren und erreichte sein Ziel.
He was not deterred and reached his goal.
To name the cause of the disturbance or distraction, the preposition 'von' with the dative is often used. The pattern is: sich von jemandem/etwas nicht beirren lassen (not to let oneself be deterred by someone/something).
Die Sportlerin ließ sich von den lauten Rufen des Publikums nicht beirren.
The athlete was not deterred by the loud calls from the crowd.
to confuse
'verwirren' and 'beirren' both have to do with someone being thrown off course internally. 'verwirren' means that someone becomes confused and no longer understands something clearly. 'beirren' is mostly used in the fixed expression 'sich nicht beirren lassen' (not to be deterred). Then it is about someone sticking to their goal despite criticism, problems, or other opinions. So 'verwirren' describes more of a state in the mind. 'sich nicht beirren lassen' describes more that you do not let yourself be dissuaded.
Lass dich von den schlechten Kommentaren nicht beirren und mach mit deinem Plan weiter.
Do not let the bad comments deter you, and keep going with your plan.
Im Gespräch verwirren mich die vielen Preise und Angebote.
In the conversation, all the different prices and offers confuse me.