
ergreifen
to seize
To take something quickly and often firmly with the hand; to grab something.
Er ergriff ihren Arm, um sie zurückzuhalten.
He seized her arm to hold her back.
to seize / take
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to seize
To take something quickly and often firmly with the hand; to grab something.
Er ergriff ihren Arm, um sie zurückzuhalten.
He seized her arm to hold her back.

to take measures
To initiate certain actions or steps in order to achieve a goal or respond to a situation.
Die Regierung muss dringend Maßnahmen gegen die Inflation ergreifen.
The government urgently has to take measures against inflation.

to move
To touch or move someone strongly emotionally.
Die traurige Geschichte hat mich tief ergriffen.
The sad story moved me deeply.

to seize the opportunity
To make use of a good possibility or chance.
Als sich die Chance bot, im Ausland zu arbeiten, hat er sofort die Gelegenheit ergriffen.
When the chance arose to work abroad, he immediately seized the opportunity.

to enter a profession
To decide on a particular career path and begin it.
Sie wollte schon immer den Beruf der Ärztin ergreifen.
She had always wanted to enter the medical profession.

to apprehend
To catch and arrest a person who has fled or committed a crime.
Der Polizei gelang es, den flüchtigen Dieb zu ergreifen.
The police managed to apprehend the fleeing thief.

to take the floor
To begin speaking in a discussion or meeting.
Nach langem Schweigen ergriff schließlich der Oppositionsführer das Wort.
After a long silence, the opposition leader finally took the floor.
The prefix 'er-' is inseparable. It remains firmly attached to the verb 'greifen' (to grasp) in all sentence forms and is not placed at the end of the sentence.
Sie ergriff die Chance und bewarb sich für die Stelle.
She seized the opportunity and applied for the position.
'Ergreifen' (to seize / take) is often more formal, elevated, or literary than the simpler verb 'nehmen' (to take). It is frequently used to describe a decisive or meaningful action.
Der König ergriff die Macht nach dem Tod seines Vaters.
The king seized power after his father's death.
To express that one is emotionally touched, the form 'ergriffen sein' (to be moved) is often used. In this case, the person is the subject of the sentence.
Wir waren alle tief von seiner Rede ergriffen.
We were all deeply moved by his speech.
The combination 'Maßnahmen ergreifen' (to take measures) is a very common fixed expression in formal contexts such as politics, business, or administration.
Die Stadt muss schnell Maßnahmen ergreifen, um die Luftqualität zu verbessern.
The city has to take measures quickly to improve air quality.
The expression 'die Gelegenheit ergreifen' (to seize the opportunity) is a fixed collocation and means to actively make use of a good chance. It is often expanded with 'um zu...' (in order to...).
Ich habe die Gelegenheit ergriffen, um mein Deutsch zu verbessern.
I seized the opportunity to improve my German.
The expression 'einen Beruf ergreifen' (to enter a profession) is a formal way to say that one decides on a career and begins it. It is often used in the context of résumés or biographical narratives.
Nach dem Abitur wusste er nicht sofort, welchen Beruf er ergreifen sollte.
After graduating from high school, he did not immediately know which profession he should enter.
In the meaning 'fangen' (to catch) or 'festnehmen' (to arrest), 'ergreifen' (to apprehend) is used almost exclusively in the context of the police, the justice system, and the pursuit of suspects or fugitives.
Spezialeinheiten konnten den Täter auf seiner Flucht ergreifen.
Special units were able to apprehend the perpetrator while he was fleeing.
'Das Wort ergreifen' (to take the floor) is a fixed idiom in discussions, debates, or meetings. It means that one begins to speak to the group.
Während der Konferenz ergriff eine junge Wissenschaftlerin das Wort.
During the conference, a young scientist took the floor.
company / undertaking
As a noun, Unternehmen can refer to a planned, often difficult action. Ergreifen is part of the expression „Maßnahmen ergreifen“ and describes initiating specific steps. Use Unternehmen for the project as a whole, and ergreifen for initiating concrete measures.

Die Bergwacht ergreift konkrete Maßnahmen zur Rettung der eingeschlossenen Wanderer.
The mountain rescue service is taking concrete measures to rescue the trapped hikers.
Die Rettung der eingeschlossenen Wanderer ist ein schwieriges Unternehmen.
Rescuing the trapped hikers is a difficult undertaking.