How to Say "good turn" in Spanish
The Spanish word for “good turn” is “servicio” — B1 level.
English → SpanishB1
NounB1
a helpful act

Examples
Gracias por el servicio, te debo una.
Thanks for the favor, I owe you one.
Como médico, su vida está al servicio de los demás.
As a doctor, his life is in the service of others.
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