little knowledge is a dangerous thing

The term "little knowledge is a dangerous thing" means that having only a small amount of knowledge on a particular topic can be more harmful than having no knowledge at all. It implies that when someone has a limited understanding of something, they may overestimate their expertise, make wrong judgments, or take ill-advised actions, leading to negative consequences. In essence, this phrase serves as a cautionary reminder that it is important to seek thorough and complete knowledge before making decisions or forming opinions.