a fifty-fifty situation; a fifty-fifty chance (often used to describe an evenly matched sporting event)
Definitions (粵典–words.hk)
名詞、俚語
五成機會 a fifty-fifty chance; literally: five five ball
阿明同廢柴阿松踢波,點可能係五五波吖?九一就差唔多。
阿明同废柴阿松踢波,点可能系五五波吖?九一就差唔多。
aa3 ming4 tung4 fai3 caai4 aa3 cung4 tek3 bo1, dim2 ho2 nang4 hai6 ng5 ng5 bo1 aa1? gau2 jat1 zau6 caa1 ng4 do1. A-ming is playing soccer against the wimpy A-chung. How is it possible that he has a fifty-fifty chance to win? 90% is more like it.