Can't peak also be used as a verb?
The topic at hand peaked my interest?
Yeh, it is a verb, though incidentally it would be "The topic at hand piqued my interest" and peaked, as in "My interest peaked."
See the test in User:Mac.
It seems to me that the definition of the verb does not really include the case where the word is used to express the fact that the peak of something is over - although the example sentence shows the direction. Still, the article doesn't say that peak would include the meaning of peak is over and decay is going on even without the mention of the decay.90.190.225.121 07:52, 8 July 2008 (UTC)
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Rfd-redundant: "(math) For sine waves, the point at which the value of y is at its maximum." seems redundant to: "(math) A local maximum of a function." or improved wording thereof. DCDuring TALK 02:46, 17 September 2010 (UTC)
Deleted disputed sense making it an example of the previous sense. --Hekaheka 05:23, 16 February 2011 (UTC)
MWOnline has another etymology (from apeak) for a verb that has to do with rowing. DCDuring TALK 20:35, 22 February 2013 (UTC)
After the talk about peak oil, I've been seeing this used in a (quasi-) adjectival manner for similar things, e.g. "have we reached peak SJW?" (i.e. had enough of those people). Equinox ◑ 23:58, 4 May 2016 (UTC)
People say they have reached a state of "peak X" for some noun X that they are sick and tired of (e.g. "peak trans": sick of constantly hearing about transgender issues), and it's also a transitive verb: to "peak" a person is to send them over the edge, to be the metaphorical straw that breaks the camel's back. "Her latest tweet is what peaked me!" etc. Equinox ◑ 21:50, 25 November 2019 (UTC)