This refers to leaving the city and heading to the threshing area. (See: [[rc://en/ta/man/translate/figs-idiom]])
# uncover his feet
This means to remove the cloak or blanket covering his feet so that they would be exposed to the cold. (See: [[rc://en/ta/man/translate/translate-symaction]])
The specific custom of that time is unclear, but this is usually understood as a culturally acceptable way for a woman to tell a man that she was willing to marry him. Boaz would understand the custom and accept or reject her offer.