Synonyms for Putting on weight:

• v.

  •fatten (verb)
  • coarsen,
  • put on weight,
  • plump,
  • increase,
  • wax,
  • feed,
  • cram,
  • fill,
  • bloat,
  • gain weight,
  • spread,
  • stuff,
  • put flesh on,
  • augment,
  • swell,
  • expand,
  • thicken,
  • overfeed,
  • broaden,
  • build up,
  • distend,
  • thrive,
  • round out.

Antonyms for Putting on weight:

• v.

  • fatten
    decrease, contract, deplete, lose, undernourish, deflate, thin, shrink.