To convert something into flint or give it flint-like hardness; to make harder or more unyielding.
From 'flint' plus the suffix '-ify' (Latin 'facere', to make). Creates a verb meaning to transform into flint or make flint-like.
The '-ify' suffix is how English turns nouns into action verbs—beautify, horrify, solidify, calcify. Scientists use it constantly: to gasify, to liquefy, to calcify. It's a powerhouse of meaning compression.
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