"Knucklehead" dates to the 19th century and comes from the literal image of a head made of knuckles or bone, suggesting hardness or stupidity. It came to mean a foolish or stupid person. The term is used in casual insults or teasing, often toward children or friends. It is derogatory but mild and sometimes playful.

What is the origin of the term "knucklehead" and how is it used?

英語での「knucklehead」の定義と意味

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