看守 (kān shǒu) means 'to guard, to watch over' and focuses on the physical act of keeping watch over a place or person, often in a security or detention context. It is more specific to guarding a location (e.g., a warehouse, entrance) than 守护 (shǒu hù), which implies dedicated, long-term protection, or 看护 (kān hù), which is about nursing or caring for someone.