fossilize

Verb
  1. Convert to a fossil (synset 200508745)
    "The little animals fossilized and are now embedded in the limestone"
    is a type of: convert - change the nature, purpose, or function of something
    subtypes: lapidify, petrify - change into stone
    same as: fossilise
  2. Become mentally inflexible (synset 200250442)
    is a type of: age, get on, maturate, mature, senesce - grow old or older
    same as: fossilise

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