We don't have any synonyms for child-proof yet.
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Definition of child-proof:
"Because of her arthritis, she always asked not to have childproof caps on her medicine bottles."
"They attempted to make the house childproof by covering all sharp corners with soft foam."
°To make something childproof.
"I debated childproofing my house, but decided against, on the basis that any scars or burns would serve as object lessons in restraint. "