Je déballe les cartons et je trouve deux casse-noix.

From Lesson 440:Plural compound nouns·French

Questions & Answers about Je déballe les cartons et je trouve deux casse-noix.

Why doesn't casse-noix change its spelling when pluralized with deux?
Casse-noix is a compound noun made of a verb (casse) and a noun (noix). In verb-noun compounds, the verb part never takes a plural marker. The noun part usually takes an -s or -x in the plural, but since noix already ends in an -x in its singular form, it remains unchanged. Therefore, it is spelled the same way in both singular and plural.
Is casse in casse-noix a conjugated verb?
Yes, it is the third-person singular present tense form of casser (to break or crack). Most verb-noun compound nouns in French are built this way, using the il/elle form of the verb followed by a direct object, such as un gratte-ciel (a skyscraper) or un porte-manteau (a coat rack).
Even though noix is feminine, is casse-noix masculine?
Yes, it is masculine (un casse-noix, des casse-noix). As a highly reliable rule, almost all compound nouns formed with a verb and a noun are masculine in French, completely regardless of the gender of the noun used inside them.
I thought carton meant cardboard. Why does it translate to boxes here?
While le carton does refer to the material cardboard, it is extremely common in everyday French to use it as a shorthand for une boîte en carton (a cardboard box). When moving house, packing, or unpacking, native speakers almost always refer to the boxes simply as les cartons.

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