How to Say "curb" in Spanish
The Spanish word for “curb” is “freno” — B2 level.
English → SpanishB2
nounB2
to keep something under control

Examples
No tiene freno cuando se pone a hablar.
He has no restraint once he starts talking.
La ley sirvió como un freno a la corrupción.
The law served as a check on corruption.
Figurative use
Just like in English, we use the word for stopping a car to describe stopping a behavior.
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