the.com/safeguard

A promise a system makes to itself before anyone gets the chance to break it.

means A safeguard is a measure put in place in advance to protect against harm, error, or loss.

from Built from 'safe' plus 'guard,' both arriving in English via French and ultimately Latin roots — 'salvus' (safe, uninjured) and 'guardare'/warder-type words meaning to watch or heed. 'Guard' itself traces back to a Germanic root tied to 'ward,' meaning to watch over or defend. The compound 'safeguard' emerged in Middle English as a noun for a formal written protection or pass guaranteeing someone's safety — literally a document that 'guarded' you and kept you 'safe.' Over time it broadened from a physical document or escort to any precaution, device, or clause built into a system to prevent harm before it happens.

etymology
Literally guard plus safe, no subtlety intended
best when
Invisible until the exact moment it is not
paradox
Too many of them become the risk itself
legal use
Often means someone already got burned once
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