pile up

堆积；积聚

piggishness, piggy, pigheaded, pigheadedly, pigheadedness, piglet, pigment, pigmentation, pigmy, pigskin, pigsty, pigswill, pigtail, pike, pikestaff, pilaff, pilaster, Pilatus Porter, pilchard, pile, pile-driver, pile-up, piles, pilfer, pilferage, pilferer, pilgrim, pilgrimage, pill, pillage, pillar, pillar-box, pillbox, pillion, pillory, pillow, pillow-fight, pillowcase (also `pillowslip), pilot, Pilot Officer,