The term 'crushing tool' can be summarized by the crossword solution of 'pestle'. A pestle is a tool used for grinding and crushing substances such as spices or herbs. It is usually made of hardwood, metal, or stone and is used in combination with a mortar. The pestle is held in one hand and used to press down on the substance being ground in the mortar. This action crushes the substance into a fine powder or paste.