The word "staunch" has several meanings, but in general it refers to something that is steadfast or unwavering. It can be used to describe a person who remains loyal and committed to someone or something, despite any challenges or obstacles they may face. For example, you might say of a friend who always stands by your side through thick and thin: "She's a true staunch friend."
In another sense, the word can also refer to something that is resistant to water or liquid, such as a fabric or material. In this context, it means that the material does not allow any liquid to pass through it, making it impermeable. For example, you might say of a raincoat: "It's made from a staunch material that will keep me dry in any weather."
Overall, the word "staunch" is used to describe something or someone that remains strong and unwavering in their beliefs, loyalty, or characteristics.