The phrase "pat on the back" is often used to describe a gesture of congratulations or approval. However, there are several antonyms which can be used to describe the opposite of this expression. These include criticism, censure, disapproval, and condemnation. Whereas a pat on the back is a positive reinforcement, criticism and disapproval aim to highlight areas of improvement. Conversely, a pat on the back may also stem from insincere flattery or manipulation, in which case antonyms such as indifference or ambivalence may be more appropriate. It is important to use the right antonym in context to convey the intended message.