"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 it has multiple definitions that seem contradict each other."
Yes I realized this, but this makes the word unnecessarily ambiguous and this new definition is the purely the result of enough people using the word incorrectly long enough.
We don't mean "destroy 10%" when we use the word decimate anymore, I get it. Natural language, migration of meaning, subjective denotation etc.
I find this interesting. I've never heard anyone use this word with the meaning that Merriam Webster (and other dictionaries) give as its primary meaning (as in, the one which includes attention to detail).
It always means "just looking around" whenever I hear anyone use it.
Would be interested to hear other's thoughts. Maybe MW should consider changing the order of their definitions.
https://www.merriam-webster.com/words-at-play/peruse-usage