The phrase "expert advice" refers to guidance or recommendations given by someone who has a high level of knowledge, skill and experience in a particular field. This person is considered an authority on the subject matter and their opinion is valued because they have extensive understanding and insight into the topic. Expert advice can be sought from professionals such as doctors, lawyers, financial advisors or other experts in various fields who have undergone specialized training and possess a deep understanding of their respective areas of expertise. The phrase is often used to emphasize that the guidance being given comes from someone with extensive knowledge and experience, making it trustworthy and reliable.