This is the 11803rd most frequent French word.
souviennent
"Remember" (third-person plural form of "se souvenir").
In this sentence, 'souviennent' is the third-person plural present indicative form of 'se souvenir', a reflexive verb meaning 'to remember'. It is used here to express that 'they' recall their past experiences.
Ils se souviennent toujours de leurs vacances en France.
They always remember their vacation in France.
Here, 'souviennent' is again used as above, inquiring about whether the people involved have retained the information shared with them previously.
Est-ce qu'elles se souviennent de ce que j'ai dit hier ?
Do they remember what I said yesterday?
In this example, 'souviennent' emphasizes the tendency or habit of children forgetting to tidy up, set within a negative form.