What is the meaning of peck?

noun

• Often followed by `of'. ( a large number or amount or extent)
  • usage: "a batch of letters"; "a deal of trouble"; "a lot of money"; "he made a mint on the stock market"; "see the rest of the winners in our huge passel of photos"; "it must have cost plenty"; "a slew of journalists"; "a wad of money"
  • synonyms: batch, deal, flock, good deal, great deal, hatful, heap, lot, mass, mess, mickle, mint, mountain, muckle, passel, pile, plenty, pot, quite a little, raft, sight, slew, spate, stack, tidy sum, wad
• A British imperial capacity measure (liquid or dry) equal to 2 gallons.
• A United States dry measure equal to 8 quarts or 537. 605 cubic inches.

verb

• Hit lightly with a picking motion.
  • synonyms: pick, beak
• Eat by pecking at, like a bird.
  • synonyms: pick up
• Kiss lightly.
  • synonyms: smack
• Eat like a bird.
  • usage: "The anorexic girl just picks at her food"
  • synonyms: pick at, peck at
• Bother persistently with trivial complaints.
  • usage: "She nags her husband all day long"
  • synonyms: nag, hen-peck