









箭在弦上 is a Chinese idiom (chengyu) meaning “the situation is so critical or pressing that action must be taken”. There's no turning back or avoiding the impending action. Literally, “Arrow on the bowstring”.
During the late Eastern Han Dynasty, Yuan Shao, aiming to attack Cao Cao, commissioned Chen Lin to compose a denunciation titled 'Proclamation for Yuan Shao Against Yuzhou.' In this document, Chen Lin listed Cao Cao's alleged offenses and severely criticized his lineage.
After Yuan Shao suffered a defeat against Cao Cao in the Battle of Guandu, Chen Lin took the opportunity to defect to Cao Cao.
Cao Cao inquired why Chen Lin had written such a scathing denunciation. Chen Lin responded that at that time, 'the arrow was on the bowstring,' implying he was compelled by Yuan Shao and had no choice but to write it.