Cách sử dụng
When we say "fight tooth and nail," we mean to fight very hard and aggressively for something. It comes from the idea of an animal fighting for its life, using both its teeth and its nails, which are weapons. We use this expression when we are talking about a situation where someone is putting all their effort into achieving something, and they are not giving up easily. It is often used when someone is fighting against great odds or facing a difficult challenge. For example, "She fought tooth and nail to keep her business running during the pandemic."