The fans rallied together with shared feeling and cheered for the home team.
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history
Fused from two classics: 《诗经·秦风·无衣》 修我戈矛，与子同仇 (repair our spears, share this enemy with you) and 《左传·文公四年》 诸侯敌王所忾 (the vassal lords share the king's indignation). 忾 (kài) here means righteous anger, not hatred in general.
mistakes
忾 is often misread as kǎi or qì. The correct reading here is kài (4th tone), a rare pronunciation preserved only in this chengyu.
