Definition of "Pestle" :

noun: a club-shaped hand tool for grinding and mixing substances in a mortar

noun: a heavy tool of stone or iron (usually with a flat base and a handle) that is used to grind and mix material (as grain or drugs or pigments) against a slab of stone

noun: machine consisting of a heavy bar that moves vertically for pounding or crushing ores

verb: grind, mash or pulverize in a mortar

"Pestle the garlic."