What is "childproofed"

Usage examples of "childproofed".

Charlie had padded every sharp corner or edge in the apartment with foam rubber and duct tape, put plastic covers on all of the electrical outlets, childproofed locks on all cabinets, installed new smoke, carbon monoxide, and radon detectors, and activated the V-Chip on the TV so that now he was incapable of watching anything that didn’t feature baby animals or learning the alphabet.