To cut potatoes into pieces in English, you can say "cut the potatoes into chunks." Chunks are pieces that are typically larger than dice, which are small cubes. You can also use other words to describe the size of the pieces, such as "slices" or "wedges," depending on how you want to cut the potatoes. For example, you might say "cut the potatoes into thin slices" or "cut the potatoes into wedges."