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To send salt to the enemy.
Literal
Enemy [to-に] salt [object-を] send.
敵に塩を送る is a famous Japanese proverb meaning 'to show kindness to an adversary' — to help an enemy in difficulty rather than exploiting their weakness. The origin story involves the Sengoku-era warlord Uesugi Kenshin sending salt to his rival Takeda Shingen when Takeda's salt supply was cut off. Dictionary form (送る) gives it the timeless quality of a proverb.