Reading upon something means to gain knowledge or information on that particular subject. There are several synonyms for "read upon" such as studying, researching, examining, perusing, exploring, scrutinizing, delving into, investigating, and reviewing. Studying means to acquire knowledge of a particular subject by reading and learning. Researching involves finding and gathering information on a certain topic. Examining means to inspect carefully or in detail. Perusing means to read through quickly. Exploring means to investigate to discover something new. Scrutinizing means to examine closely or critically. Delving into means to explore deeply. Investigating means to carry out a systematic inquiry to discover the truth. Reviewing means to assess or evaluate something carefully.