howler
🇺🇸
/ˈhaʊlər/
🇬🇧
/ˈhaʊlə(r)/
a very silly or obvious mistake, especially in something said or written
He made a howler during his presentation that made everyone laugh.
彼はプレゼンテーション中に大きなミスを犯し、皆を笑わせた。