fossilize
intransitive-verb
UK: /ˈfɒs.ɪ.laɪz/
US: /ˈfɑː.səl.aɪz/
To become a fossil, or to change something into a fossil.
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Bones can fossilize over millions of years in the earth.
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The scientists were studying how plants fossilize in different conditions.
To become fixed and unable to change or develop.
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Old habits fossilize if you don't actively break them.
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Their opinions began to fossilize after years in the same job.