debieron
-they owed
The word debieron is the preterite form of deber in the third person plural.
See the full deber conjugation

deber

Estas infecciones se debieron a bacterias, micobacterias, hongos y virus.
These infections were due to bacteria, mycobacteria, fungi and viruses.
El suspense y ansiedad de esa noche debieron ser terribles.
The suspense and anxiety of that night must have been terrible.
En este aspecto ustedes debieron haber llamado por su supresión.
At that point you should have called for its suppression.
Sí, mi compañera y su novio debieron hacerlo.
Yeah, my roommate and her boyfriend must have done it.
Estos tipos debieron contactar con él más de una vez.
These guys had to have contacted him more than once.
Está bien, debieron haber leído esto durante el verano.
Okay, you should have read this over the summer.
Bueno debieron haber pensado que algo estaba un poco raro.
Well, you must have thought something was a little bit off.
Estas cosas debieron haber dejado una huella en tu carrera.
These things had to have an impact on your career.
Sí, y sus amigos debieron haber pensado en eso.
Yes, and your friends should've thought of that.
Los días del Génesis debieron haber sido más largos que 12 horas.
The days of Genesis must have been longer than 12 hours.
Sí, debieron usar a uno de los Hermanos Chuckle.
Yeah, they should have got one of the Chuckle Brothers.
Las observaciones referidas a ciertos costes de instalación debieron rechazarse.
Comments referring to some installation costs had to be rejected.
Estos resultados sugieren que los efectos vistos se debieron a la suerte.
These results suggest that the effects seen were due to chance.
Parece que anoche los asesinos debieron cometer un error.
Looks like the assassins must have made a mistake last night.
Todos los pueblos de la región debieron pasar por sufrimientos enormes.
All the peoples of the region had to go through enormous suffering.
Yo creo que debieron haber sido más que eso.
I think there must have been more than that.
Los argumentos de esta parte debieron, por tanto, rechazarse.
The arguments of the party had to be thus rejected.
Chicos, tuve un enorme almuerzo, y debieron ser los tacos.
Guys, I had a huge lunch, and it had to be tacos.
El doctor dijo que debieron extirpar parte de tu pulmon.
The doctor tells me that they had to remove part of your lung.
Las dos son guapas, así que debieron haber sido muy monas.
You're both pretty, so it must have been very cute
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