This is the 3139th most frequent French word.
prolonger
To extend or lengthen in time or space.
In this sentence, 'prolonger' conveys the action of extending the length of something, specifically the stay.
Ils ont décidé de prolonger leur séjour d'une semaine.
They decided to extend their stay by one week.
Here, 'prolonger' is used to expand the duration or scope of the discussion to achieve a better understanding of the topic.
Le professeur a demandé à prolonger la discussion pour approfondir le sujet.
The teacher asked to prolong the discussion to delve deeper into the subject.
In this instance, 'prolonger' emphasizes the continuation or persistence in effort to attain a goal.