This is the 310th most frequent French word.
souligné
Underlined.
In this sentence, 'souligné' (a verb) is used to signify that the teacher emphasized or highlighted the significance of something.
Le professeur a souligné l'importance de la lecture quotidienne.
The teacher emphasized the importance of daily reading.
Here, 'souligné' functions as the past participle in the passive voice, indicating that the printed text had been physically underlined.
Le texte imprimé était souligné pour attirer l'attention.
The printed text was underlined to attract attention.
In this instance, 'souligné' describes the tone, suggesting that it was emphasized or given special stress to convey importance.