The crossword solution for the term 'buckle from heat' is 'WARP'. WARP is a term used to describe when a material, such as wood or metal, bends or twists due to exposure to heat. This can be caused by a variety of factors, including changes in temperature, humidity, and other environmental conditions. Warping can also occur when a material is exposed to direct sunlight or other sources of intense heat. Buckling from heat is a type of warping that occurs when a material is exposed to extreme temperatures, causing it to buckle or bend.