Are Posts Truly Dumb?
Dumb as a post means someone who is very stupid, like a fence post.
A phrase with a meaning that is commonly understood by speakers of the language, but that is often different from the normal meaning of the words, is called an idiom.
In American informal use, if you are describing someone as dumb as a post, you are saying they are very stupid.
Example: She’s one of the most famous physicists in the country, and she’s dumb as a post!
There are other variations of the phrase: “Dumb as a doorknob,” “Dumb as dirt,” and “Dumb as a doornail,” but the list is immense. All of these are similes, a figure of speech involving the comparison of one thing with another of a different kind, as a description using the words like or as.
Another weird phrase, because how can an inanimate object be stupid?