deshidrataban
Imperfecto para el sujeto ellos/ellas/ustedes del verbo deshidratar.

deshidratar

Las aletas de Kumena empezaron a encresparse y secarse; sus branquias se deshidrataban y el sol seguía sin moverse en el cielo.
His fins began to curl and desiccate, his gills grew dry, and still the sun did not move in the sky.
Los corredores se deshidrataban porque hacía mucho calor.
The runners were becoming dehydrated because it was really hot.
Palabra del día
el relleno