This is the 11540th most frequent Russian word.
дочерьми
"Дочерьми" means "by/with daughters" (instrumental plural form of "дочь," meaning "daughter").
The word 'дочерьми' is a plural instrumental case of 'дочь', used to indicate means or accompaniment in this sentence.
Они гордятся своими дочерьми, которые достигли успеха.
They are proud of their daughters who achieved success.
Here, 'дочерьми' serves as a means or accompaniment in the instrumental case, denoting with whom the action is performed.
С дочерьми мы отправились в парк для прогулки.
With the daughters, we went to the park for a walk.
The word 'дочерьми' in this sentence shows the involvement of the daughters in the context of the discussion.