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| English | Russian |
| become too sour | проквашиваться (during fermentation, pickling) |
| become too sour during fermentation, pickling | проквашиваться (impf of прокваситься) |
| become too sour during fermentation, pickling | прокваситься (pf of проквашиваться) |
| become too sour | прокваситься (during fermentation, pickling) |
| too sour | перекислый |