What is the meaning of plumping?

verb

• Drop sharply.
  • usage: "The stock market plummeted"
  • synonyms: plummet, plump
• Set (something or oneself) down with or as if with a noise.
  • usage: "He planked the money on the table"; "He planked himself into the sofa"
  • synonyms: plank, flump, plonk, plop, plunk, plump down, plunk down, plump
• Make fat or plump.
  • usage: "We will plump out that poor starving child"
  • synonyms: fatten, fat, flesh out, fill out, plump, plump out, fatten out, fatten up
• Give support (to) or make a choice (of. one out of a group or number)
  • usage: "I plumped for the losing candidates"
  • synonyms: plump, go

adjective

• Very large; of exceptional size for its kind.
  • usage: "won by a plumping majority"