This is the 11568th most frequent French word.
réfléchissent
"Réfléchissent" means "they reflect" or "they think."
Here, 'réfléchissent' means 'are thinking' or 'are reflecting' and is used in the context of actively considering or pondering solutions to problems.
Les étudiants réfléchissent aux problèmes mathématiques.
The students are thinking about mathematical problems.
In this sentence, 'réfléchissent' conveys the act of contemplation or deliberation to consider consequences before acting.
Ils réfléchissent avant de prendre une grande décision.
They think carefully before making a big decision.
Here, 'réfléchissent' is used in its physical sense, meaning 'reflect' as in the phenomenon of light bouncing off a surface.