Sash Neighbor is a job title in the construction industry. It refers to a person who installs sashes, which are the movable parts of a window frame, such as the vertical and horizontal sliding panels. The job requires precision and accuracy, as the sashes must be installed correctly in order to ensure the window functions properly. The term Sash Neighbor is derived from the four-letter word SILL, which is the part of the window frame that rests on the outside wall of a building.