No. 12,019 in Russian
зеркалом
"Зеркалом" means "mirror" in instrumental case in Russian.
In a sentence
Я смотрюсь в зеркало каждое утро.
I look at myself in the mirror every morning.
The word 'зеркало' refers to a mirror and is used in the instrumental case here, 'зеркалом', which indicates the indirect object of the action.
Он украшал стену большим зеркалом.
He decorated the wall with a large mirror.
Here, 'зеркалом' is in the instrumental case, showing the means (the mirror) by which the wall was decorated.
Мы осветили комнату зеркалом, отражающим свет.
We illuminated the room with a mirror reflecting light.
In this example, 'зеркалом' is in the instrumental case to indicate the tool (the mirror) used to accomplish the action of illumination.
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