Peruse can mean "to read something in a relaxed way, or skim" and can also mean "to read something carefully or in detail." It is what is known as a contronym, ...

to read or look at something in a relaxed way: He opened the newspaper and perused the sports pages.

Peruse can mean "to read something in a relaxed way, or skim" and can also mean "to read something carefully or in detail." Peruse is thus a contronym because ...

verb · to read or examine with care; study · to browse or read through in a leisurely way ...

Traditionally, peruse has meant to read or examine something carefully. But informally, it can have the opposite meaning, to read something casually and quickly ...