In Italian “giallo” means yellow.
Giallo might be a lemon, the colour of a jumper and even a pair of trousers.
But what would you think if you heard the phrase mi piacciono i gialli? or guardo un giallo or leggo molto i gialli.
Because in Italian”giallo” is also a noun. We refer to a thriller book, movie or a detective story as un giallo. The origin of the use of this word in these contexts derives from the yellow covers of the very first thriller books published in Italy.
Antonio