they had stumbled
-avaient trébuché
Past perfect they conjugation of stumble.

stumble

There are scientists so arrogant today that they are already patenting their discoveries, as if they had stumbled upon their own creation.
Certains scientifiques sont si arrogants de nos jours qu'ils sont déjà en train de faire breveter leurs découvertes, comme s'il s'agissait de leur propre création.
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