The phrase "study at slaughter" is not one that is commonly used. However, there are numerous synonyms that can be used to convey similar meanings. Some options might include examining closely, investigating thoroughly, analyzing in detail, researching extensively, or scrutinizing with care. Each of these alternatives highlights the importance of careful observation and analysis, whether in the context of a scientific investigation or a more personal examination of a particular situation or topic. By using synonyms in place of more unusual phrases like "study at slaughter," writers can ensure that their meaning is clear to readers and that their message is conveyed effectively.