 |
| |||
| by a happy coincidence (Bullfinch); by happy fortune (_Volha_); as luck would have it (Баян); by a fortunate coincidence (m_rakova); by luck; by good luck; by a singular piece of good fortune | |||
| Serendipitously (вариант – благодаря счастливому стечению обстоятельств Dmitrarka) | |||