
bremsen
brake
To reduce the speed of a vehicle or a movement, or bring it to a stop.
Der Autofahrer musste vor dem Zebrastreifen stark bremsen.
The driver had to brake hard before the crosswalk.
to brake / slow down
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brake
To reduce the speed of a vehicle or a movement, or bring it to a stop.
Der Autofahrer musste vor dem Zebrastreifen stark bremsen.
The driver had to brake hard before the crosswalk.

slow down
To slow down, hinder, or stop a development, process, or person.
Hohe Zinsen bremsen das Wirtschaftswachstum.
High interest rates slow down economic growth.

hold oneself back
To restrain or control oneself in order to refrain from an action or statement.
Er musste sich bremsen, um nicht sofort wütend zu antworten.
He had to hold himself back so he wouldn't immediately reply angrily.
The verb 'bremsen' (to brake) is closely related to the noun 'die Bremse' (the brake). When you brake, you use a vehicle's brake.
Die Bremsen an meinem Fahrrad sind neu, deshalb bremst es sehr gut.
The brakes on my bike are new, so it brakes very well.
In a figurative sense, you can also slow down abstract things. Typical objects here are developments or processes such as 'das Wachstum' (growth), 'der Fortschritt' (progress), or 'die Nachfrage' (demand).
Die Bürokratie bremst viele wichtige Bauprojekte.
Bureaucracy slows down many important construction projects.
The reflexive form 'sich bremsen' means to restrain or control oneself. The reflexive pronoun is in the accusative.
Sie wollte eine wütende E-Mail schreiben, aber sie hat sich im letzten Moment gebremst.
She wanted to write an angry email, but she held herself back at the last moment.
to hinder / obstruct
Behindern and bremsen can both make a development or work progress more slowly. Behindern is more general and refers to difficulties or disruptions that make progress more difficult. Bremsen emphasizes more strongly that the pace of an ongoing development or process is reduced.

Die vielen Rückfragen bremsten die Arbeit des Forschungsteams deutlich.
The many follow-up questions noticeably slowed down the research team's work.
Die fehlenden Daten behinderten die Arbeit des Forschungsteams erheblich.
The missing data significantly hindered the research team's work.