This is the 622nd most frequent Ukrainian word.
справу
"справу" - "case," "matter," "affair," or "business" (accusative singular form).
The word "справа" here is used to mean "matter" or "issue" in a formal or abstract sense.
Ця справа потребує вирішення.
This matter requires a resolution.
The word "справа" in this context is used to refer to a task or a piece of work.
Ми взялися за цю справу разом.
We tackled this task together.
Here, "справа" refers to one's profession, craft, or skill.