por rata

El papel a menudo era peligroso debido al riesgo de contagio, y los captadores eran pagados por los propietarios por rata.
The role was often dangerous because of the risk of contagion, and catchers were paid by property owners on a per rat basis.
Tus amigos no quieren salir contigo por rata.
Your friends don't want to go out with you for being such a tightwad.
Nunca dejas propina y por eso no son amables contigo. Te está bien empleado por rata.
You never leave a tip, that's why they're not kind to you. It serves you right for being such a cheapskate.
Tomé un bus en lugar de un taxi y llegué tarde. Esto me pasa por rata.
I took a bus instead of a taxi, and I arrived late. That's what I get for being such a skinflint.
Su esposa lo riñó por rata y por dejar que su hija saliera a la calle sin un céntimo en el bolsillo.
His wife scolded him for being so stingy and letting their daughter go out without a cent in her pockets.
Palabra del día
aterrador