This is the 11344th most frequent Russian word.
детище
Brainchild.
Here, 'детище' metaphorically signifies 'a creation or work conceived by someone', expressing a sense of deep personal pride and connection.
Она гордилась своим детищем, её первым опубликованным романом.
She was proud of her creation, her first published novel.
The term 'детище' is used figuratively to denote a significant and cherished undertaking or project.
Этот проект стал его главным детищем за последние годы.
This project has become his main 'brainchild' over the last years.
In this example, 'детище' reflects the personal achievement and hallmark of the creator.