protect
To keep someone or something safe from harm or danger.
To protect means to keep someone or something safe from harm, danger, or damage. When you protect your younger sibling from a bully, you're standing between them and something threatening. When a goalkeeper protects the net in soccer, she's working to prevent the other team from scoring.
Protection takes many forms. A bicycle helmet protects your head if you fall. A password protects your email account from strangers. Parents protect their children by teaching them to look both ways before crossing the street. A lawyer protects her client's rights in court. Scientists protect endangered species by preserving their habitats.
The word carries a sense of active defense or shielding. You don't just hope nothing bad happens: you take steps to prevent it. A raincoat protects you from getting wet. A spare copy of your homework protects you from losing all your work if your backpack goes missing. Some protection is physical, like a castle's walls or a football player's pads. Other protection is less visible but equally important, like laws that protect people's freedom of speech or a friend who protects your reputation by defending you when others gossip.
When you protect something, you're showing that it matters to you and deserves to be kept safe and respected.