means A liquid soap formulated for washing the hair and scalp, or the act of using it.

from From Hindi 'champo,' the imperative of 'champna' — to press, knead, or massage — itself rooted in the Sanskrit 'capayati,' to pound or knead. British colonists in 18th-century India encountered the practice as a luxurious head massage and oil treatment, and carried the word home, where it gradually drifted from 'massage' to 'wash the hair,' acquiring its soapy modern meaning along the way.