To make something bronze in color or appearance; to give something a bronze-like quality or finish.
From bronze + the suffix '-ify' (to make or cause to be). The '-ify' suffix comes from Latin '-ficare' (to make) and became productive in English.
The '-ify' suffix is how English creates action verbs—beautify, simplify, terrify, bronzify—it's basically saying 'cause something to become [adjective]' and it's endlessly creative.
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