bad things come in threes

English

If one unfortunate event has already occurred, a second and third are likely to occur; if two, a third should be expected.
Antonym: good things come in threes

several unfortunate events usually occur together

Arabic: لا تأتى المصائب فرادى (literally “misfortunes don't come singly”)
Chinese:
Mandarin: (no exact equivalent exists) 禍不單行 / 祸不单行 (zh) (huòbùdānxíng)
Finnish: ei kahta ilman kolmatta (literally “no two without a third”) (not exclusively of bad things)
French: jamais deux sans trois (fr)
Italian: non c'è due senza tre (literally “there is no two without three”) (also “good things come in threes”)
Polish: nieszczęścia chodzą parami (pl) (lit. misfortunes come in pairs)
Portuguese: please add this translation if you can