/prəˈfɛʃənl ˈnɛɡlɪdʒəns/ – Phrase
Definition: Hành vi thiếu trách nhiệm chuyên nghiệp.
A more thorough explanation: grounds for a legal action against a professional (=someone whose work requires a long period of specialist training) because they did not take care or exercise enough skill in their work
Example: He accused the firm of professional negligence.