The crossword solution for the term 'give one's opinion' is ADVISE. To ADVISE someone is to give them an opinion or recommendation based on one's knowledge, experience, or understanding. It is often used in a professional context, such as when a lawyer advises their client on a legal matter or when a doctor advises a patient on a medical issue. However, it can also be used in a more casual setting, such as when a friend advises another friend on a personal matter.