Usage Note
Là-dessus is a compound adverb combining là (there) and dessus (on top), used to refer back to something just mentioned — similar to English 'on that note' or 'with that'. It often signals a speaker's pivot or conclusion: là-dessus, il est parti ('with that, he left').
Examples
"Là-dessus, elle a quitté la pièce."
Natural Translation
With that, she left the room.
Literal Translation
On that, she left the room.

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