your hair; their hair
Tom e Mary provavelmente pintam seus cabelos.
Tom and Mary probably dye their hair.
Tom e Mary não lavaram seus cabelos.
Tom and Mary didn't wash their hair.
Her hair is long.
Maria não lavou seus cabelos.
Maria didn't wash her hair.
As mulheres de Moscou deram seus cabelos aos tártaros.
The women of Moscow gave their hair to the Tatars.
— Andrei Rublev (1966)
E não se esqueça de lavar seus cabelos!
And don't forget to wash your hair!
— Lanternas Vermelhas (1991)
Mary alisou seus cabelos.
Mary smoothed her hair.