Usage Note
Soif is always feminine and used in the idiom avoir soif ('to be thirsty') — French uses avoir where English uses 'to be'. The figurative phrase soif de means 'a thirst for' (e.g. soif de connaissance). The final 'f' is pronounced.
Examples
"J'ai très soif après cette longue marche."
Natural Translation
I am very thirsty after that long walk.
Literal Translation
I have very much thirst after this long walk.

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