The crossword solution for the term 'Leak In or Out' is 'SEEP'. Seepage is the slow movement of liquid through a porous material, such as soil or rock. It can occur naturally, or it can be caused by human activities, such as the construction of dams or irrigation systems. Leaks in or out refer to the movement of water through a material, either into or out of an area. Seepage is a common form of leakage, and can cause significant damage if not addressed.