Designed or constructed so that foxes cannot break through, enter, or damage it; resistant to fox interference.
Compound word combining 'fox' (the animal) with 'proof' (from Old French 'prove,' meaning 'to test' or 'make resistant'). '-Proof' constructions became common in English for materials designed against specific threats.
Farmers who raise chickens spend serious money on 'foxproof' fencing because a single fox is basically a flying ninja that tunnels—the term represents an entire agricultural arms race between humans and predators that's been happening for thousands of years.
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