What is the meaning of piled?

verb

• Arrange in stacks.
  • usage: "heap firewood around the fireplace"; "stack your books up on the shelves"
  • synonyms: stack, pile, heap
• Press tightly together or cram.
  • usage: "The crowd packed the auditorium"
  • synonyms: throng, mob, pack, pile, jam
• Place or lay as if in a pile.
  • usage: "The teacher piled work on the students until the parents protested"
  • synonyms: pile