Posting or postadh (Scottish Gaelic) is a term formerly used in Scotland for a process in washing clothes.
In scouring woollen clothing, blankets or coarse linen, when the strength of the arms and manual friction are found insufficient, Highland women put them in a tub with a prop – or quantity of water, then, with petticoats tucked up, they began to "post", which they continued until every part of the clothes received an effectual cleansing.
Treading cloth with the feet, a time-consuming and laborious practice, has long been superseded by mechanical methods, starting in the Industrial Revolution.
There is some overlap with the process of making cloth, in that both involve textiles immersed in water.
This article incorporates text from Dwelly's [Scottish] Gaelic Dictionary (1911).