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| Subject | Russian | English |
| gen. | копить деньги и т.д. на чёрный день | set money part of one's income, a little, etc. aside for a rainy day (for a special case, for one's children's education, for a possible emergency, for future use, etc., и т.д.) |
| idiom. | копить на чёрный день | save for a rainy day (Andrey Truhachev) |
| idiom. | копить на чёрный день | save up for a rainy day (Andrey Truhachev) |