fail-safe
UK[ˈfeɪl seɪf]US[ˈfeɪl seɪf]
adj
Designed to return to a safe condition in the event of a failure or malfunction.
n
A system or mechanism that operates in this way.
Morpheme Breakdown
fail
safe
fail
safe
Etymology
The compound 'fail-safe' is a modern engineering term, originating in the mid-20th century. It logically combines the verb 'fail', with its Latin root meaning "to deceive or disappoint," and the adjective 'safe', from a Latin root meaning "unharmed." The term's literal construction transparently describes its function: a device or system that, upon failing, defaults to a state that is inherently safe, thereby preventing catastrophe. This concept represents a direct application of core English vocabulary to address technological risk, evolving from abstract notions of disappointment and security into a precise technical principle.
Analysis
Structure: fail + safe
fail: From Middle English 'failen', from Old French 'faillir', from Latin 'fallere' (to deceive, disappoint). Functional role: Verb root indicating a cessation of function or success.
safe: From Middle English 'sauf', from Old French 'sauf', from Latin 'salvus' (uninjured, healthy). Functional role: Adjective root indicating freedom from danger or risk.
Examples
The nuclear reactor is equipped with multiple fail-safe mechanisms.
The pilot relied on the aircraft's fail-safe to prevent a stall.
This procedure includes a fail-safe to protect user data.