## Etymology
American slang for a blunder, early 20th century, probably from bonehead (a stupid person) plus -er, or a play on bone in the sense of a comedy mistake. Ultimately from bone, Old English bān.

## AI Etymology
Boner is a noun meaning "(informal) a foolish and embarrassing mistake". Historically, it is american slang for a blunder, early 20th century, probably from bonehead (a stupid person) plus -er, or a play on bone in the sense of a comedy mistake. Ultimately from bone, Old English bān. The visible construction is part of the etymology: boner is not just an unanalyzed simple word. The semantic history matters here: the earlier use is the starting point, and the modern sense, "(informal) a foolish and embarrassing mistake", is the later or specialized English value. The historical chain is anchored in Old English bān. Close English family members include bonehead, and bone.

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