Collapse by Jana L | Mar 1, 2022 | Glossary of Terms, Glossary of Terms -C, Uncategorized | 0 comments The flattening of single cells or a row of cells in hardwood during the drying or pressure treatment of wood characterized externally by a caved-in or corrugated appearance. Submit a Comment Cancel replyYour email address will not be published. Required fields are marked *Comment * Name * Email * Website Save my name, email, and website in this browser for the next time I comment.