This is the 13239th most frequent Spanish word.
propina
Tip (a gratuity given for services).
In this sentence, 'propina' refers to the money given as a gratuity to a service worker.
Dejé una propina para el mesero después de la cena.
I left a tip for the waiter after dinner.
Here, 'propina' is used in a general sense, indicating the act of giving extra money as a reward for service.
Siempre es bueno dar una propina adecuada por un buen servicio.
It is always good to give an adequate tip for good service.
'Propina' in this context is a cultural norm referring to the practice of tipping.