
mitreißen
to captivate
To move someone emotionally, inspire them, and motivate them to join in.
Die Energie des Sängers hat das ganze Publikum mitgerissen.
The singer's energy captivated the whole audience.
to captivate / sweep away
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to captivate
To move someone emotionally, inspire them, and motivate them to join in.
Die Energie des Sängers hat das ganze Publikum mitgerissen.
The singer's energy captivated the whole audience.

to sweep away
To catch someone or something with a strong physical force and pull them along.
Die Flutwelle war so stark, dass sie Autos und sogar kleine Häuser mitgerissen hat.
The tidal wave was so strong that it swept away cars and even small houses.
'Mitreißen' (to captivate/sweep away) is a separable verb with the prefix 'mit-'. In a main clause, the prefix comes at the end. In subordinate clauses or in the infinitive with 'zu', the verb stays together.
Die Musik reißt einfach jeden mit.
The music simply captivates everyone.
The meaning depends on the subject and object. If a person is moved by something abstract, such as Musik (music), Rede (speech), or Begeisterung (enthusiasm), the emotional meaning is intended. If a person or object is moved by a physical force, such as Fluss (river) or Sturm (storm), the literal meaning is intended.
Seine Begeisterung riss das ganze Team mit.
His enthusiasm swept up the whole team.
The very common adjective 'mitreißend' (captivating/gripping) is derived from this verb. It describes something that inspires and moves people emotionally, such as ein mitreißendes Konzert (a captivating concert) or ein mitreißender Film (a gripping film).
Das war ein wirklich mitreißendes Fußballspiel.
That was a truly thrilling football match.
In the physical meaning, 'mitreißen' (to sweep away) is often used with strong forces of nature. Typical phrases are: 'von der Strömung mitgerissen werden' (to be swept away by the current) or 'vom Sturm mitgerissen werden' (to be swept away by the storm).
Das kleine Boot wurde von der starken Strömung mitgerissen.
The small boat was swept away by the strong current.
to inspire / enthuse
Begeistern and mitreißen both describe a strong positive effect on an audience. Mitreißen additionally emphasizes that people are emotionally energized and happy to join in, while begeistern also works for simple enjoyment or admiration. Choose mitreißen when the reaction leads to people acting together.

Die Aufführung riss das Publikum mit, sodass alle im Rhythmus mitsangen.
The performance swept the audience along, so everyone sang along to the rhythm.
Die Aufführung begeisterte das Publikum, das am Ende lange applaudierte.
The performance delighted the audience, who applauded for a long time at the end.