hippo’s tooth
n.— «At the same time, the cement bollards, affectionately known as “hippo teeth,” will be replaced by historically correct guardrails made of cedar and steel.» —“Mountain rehab is tough trek” by Jessica Willis Berkshire Eagle (Pittsfield, Massachusetts) July 28, 2007. (source: Double-Tongued Dictionary)
Further reading
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The autocomplete function on your phone comes in handy, of course. But is it changing the way we write and how linguists study language? Also, suppose you could invite any two authors, living or dead, to dinner. Who’s on your guest list and...