Решение по жалобе пришло вчера.

The decision on the complaint arrived yesterday.

Breakdown of Решение по жалобе пришло вчера.

• вчера: yesterday
• прийти: to arrive
• решение по жалобе: the decision on the complaint

Questions & Answers about Решение по жалобе пришло вчера.

Why is the verb пришло and not пришёл or пришла?

Because the subject is решение (decision), and решение is a neuter noun in Russian.

In the past tense, Russian verbs agree with the gender and number of the subject:

• masculine: пришёл
• feminine: пришла
• neuter: пришло
• plural: пришли

So:

• решение пришло = the decision came/arrived

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What case is жалобе, and why is it in that case?

Жалобе is in the dative singular.

The base form is жалоба (complaint). After the preposition по, Russian often uses the dative case in meanings like regarding, concerning, or in connection with.

So:

• жалоба = complaint
• по жалобе = regarding the complaint / on the complaint

This is a very common official or bureaucratic pattern in Russian.

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What does по жалобе mean here exactly?