failure to thrive

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failure to thrive (usually uncountable, plural failures to thrive)

  1. Used other than with a figurative or idiomatic meaning: see failure,‎ thrive.
  2. (uncountable, pediatrics) Poor physical growth or level of weight, relative to one's age peers.
  3. (uncountable, medicine, chiefly geriatrics) Abnormal weight loss, malaise.
  4. (countable, medicine) Instances of poor physical growth or of abnormal weight loss.