Chorobou

Chorobou is the instrumental singular form of the Czech noun choroba, which means disease or illness. It is not a separate concept but a grammatical form used when the disease is described as an instrument or factor in actions, typically after the preposition s (with) or with verbs that govern the instrumental case.

In use, chorobou appears in phrases such as bojuje s chorobou (fights with a disease) or trpí chorobou (suffers from a disease). It can also appear in constructions where the disease is the context of discussion, for example when speaking about treatment or impact, where the instrumental form helps connect the disease to the action or state described.

Etymology and related forms: choroba is of common Slavic origin, with cognates in other Slavic languages, such as Polish choroba and Slovak choroba. The instrumental form chorobou is a standard grammatical inflection used in Czech (and similarly in Slovak) to denote the disease as an abstract or instrumental element in a sentence.

Notes on usage: the instrumental case contrasts with the accusative chorobu (direct object of the verb mít, zažívat, or similar) and with the locative or other cases used after different prepositions. Correct use depends on the governing verb and preposition; for example, s chorobou requires the instrumental, whereas o chorobě uses the locative case to indicate about which disease one is speaking.

Overall, chorobou is a normal, widely used grammatical form in Czech to refer to disease in contexts that require the instrumental case.