hibernation

Noun
  1. The torpid or resting state in which some animals pass the winter (synset 114038320)
  2. Cessation from or slowing of activity during the winter;
    Especially slowing of metabolism in some animals (synset 114037452)
  3. The act of retiring into inactivity (synset 100213226)
    "he emerged from his hibernation to make his first appearance in several years"

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