Metaphorical limitations
A few years ago, I noticed an apparent boom in "Peak X" (see also "'Peak X' abides" and "Peak friend"), and reported concerns that the peak bubble might have burst ("Peak peak has apparently passed"). But a scan of recent news stories suggests that the peak X construction has established itself solidly in the journalistic lexicon. In addition to the obvious things like "peak foliage", "peak leaf season", "peak fire season", and "peak earnings", we can read about "peak plastic", "peak crazy", "peak absurdity", "peak patent", "peak Fortnite", "peak grunge", and "peak First Take yelling".
In one of those posts back in 2014, I wondered why "there's no 'valley X' or 'trough X' corresponding to 'peak X'". And for that matter, why no "summit X"?
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