"Frown on somebody" means to:

Explanation

The phrase 'frown on somebody' is a phrasal verb that means to disapprove of someone or something. It is often used to express judgment or disapproval of actions or behaviors that are considered undesirable. Option A (Fall flat upon a stranger) and Option B (Stay alive working hard) are unrelated to the concept of disapproval. Option C (Unable to be successful) indicates a lack of achievement but not disapproval from others. Therefore, the correct answer is Option D, which accurately reflects the meaning of the phrasal verb.