Usage Note
sur-le-champ is a fixed adverbial phrase meaning 'right away, instantly.' Here champ keeps its literal sense of 'field,' originally the field of action or battlefield. It is slightly more formal than tout de suite and conveys a sense of decisive, immediate action.
Examples
"Il a obéi sur-le-champ sans poser de questions."
Natural Translation
He obeyed immediately without asking questions.

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