Leach is a process used to separate substances from a mixture. It involves the use of a liquid, such as water, to extract soluble components from a solid material. The term 'leach' can also refer to the liquid that is used in the process. The crossword solutions for the term LEACH are PERCOLATE (9 letters), OOZE (4 letters), and LIXIVIATE (9 letters). PERCOLATE means to filter or strain a liquid through a porous material, while OOZE is a slow, steady flow of a liquid. LIXIVIATE is the process of extracting soluble components from a solid material by leaching it with a liquid.