Usage Note
Besoin almost never stands alone: the workhorse construction is avoir besoin de, so j'ai besoin de toi means 'I need you' where English uses a plain verb. The impersonal si besoin means if necessary, and les besoins in the plural are one's needs.
Examples
"J'ai besoin de repos."
Natural Translation
I need some rest.
Literal Translation
I have need of rest.

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