1. Refusal or inability to do: When a man says' no ', the most direct meaning is that he refuses to do something or believes he cannot do something. This may be due to various reasons, such as insufficient ability, time constraints, personal wishes, or opposition in principle.
2. Negative or Disagree: When expressing opinions or discussing, "no" may also indicate that he holds a negative attitude towards a proposal, plan, or viewpoint, and does not agree to proceed or implement it.
3. Emphasizing limitations or infeasibility: Sometimes, 'no' is used to emphasize the limitations of a situation or condition, indicating that a certain approach or choice is not feasible in the current context and requires finding alternative solutions.