child-proof

The word 'child-proof' is a modern compound, formed in the 20th century following the established English pattern of combining a noun with the suffix '-proof'. The suffix '-proof' originates from the notion of being able to withstand a test or trial, as seen in words like 'waterproof' (resistant to water) and 'fireproof' (resistant to fire). By applying this pattern, 'child-proof' logically means "resistant to children" or "able to withstand the actions of a child," implying a design that prevents accidental opening or harm. This compound reflects a societal focus on child safety, creating a clear, functional descriptor for products and modifications in domestic environments.

Structure: child (young person) + proof (resistant) - child: From Old English 'cild', meaning a fetus, infant, or young person. In this compound, it functions as a noun modifier specifying the target. - proof: From Old French 'preuve', meaning evidence or test, and ultimately from Latin 'probare' (to test, prove). In compounds, it functions as an adjective-forming suffix meaning "resistant, impervious, or protected against."