呉越ごえつ同舟どうしゅう
goetsudōshū

Noun

1. bitter enemies in the same boat; rivals finding themselves together by chance; strange bedfellows

Yojijukugo
Related to 呉越
ドジャースとジャイアンツが呉越ごえつ同舟どうしゅうでやってきた。
dojāsuto jaiantsuga goetsudōshūde yattekita.
The Dodgers and Giants, traditional rivals, arrived together.