guardrail
A rail set alongside a dangerous place as a barrier, to improve safety. / (figuratively, by extension) Any barrier designed to prevent accidents or mistakes.
Of, or pertaining to Pierre-Joseph Proudhon or his ideas.
present participle of pillarize
A type of urban explorer who visits the ancient catacombs and quarries linked by tunnels beneath Paris. / (by extension) Any individual who explores subterranean quarries, mines, or catacombs.
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