No. 17,634 in Russian
убийствами
"Убийствами" means "murders" (instrumental plural form).
In a sentence
Полиция занимается расследованием убийствами, чтобы найти виновных.
The police are investigating murders to find the culprits.
In this sentence, 'убийствами' is the instrumental plural form of 'убийство', meaning 'murders'. It indicates the means by which the investigation is focused.
Историки изучают информацию, связанную с убийствами в средневековье.
Historians study the information related to murders in the Middle Ages.
Here, 'убийствами' again is the instrumental plural form, signifying the association or handling of topics related to murders.
Сериал поражает своим сюжетом, связанным с таинственными убийствами.
The series amazes with its plot related to mysterious murders.
In this usage, 'убийствами' portrays the concept of murders as an aspect of the story plot, in instrumental case emphasizing the relation.
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