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I have come across the following sentence and cannot quite make out a satisfying translation for how 'lisser' is used here. The dictionary says 'to smooth, to even out' but I do not think that this fits here.
Elle ajoute aussi que la fiabilité des informations est mise en danger par les applications qui lissent arbitrairement le Nutri-Score.
The meaning is the one you found in a dictionary.
The applications referred to are criticized because they smooth (i.e. make less relevant) the Nutri-Score by weighting it with other metrics or whatever algorithm.
Source: Mathilde Touvier Magazine de l'Inserm - n° 44
