敵に塩を送る
1
to save an enemy from trouble instead of taking advantage of their weakness;to show humanity even to one's enemy;to help one's enemy in difficulty
from Uesugi Kenshin sending salt to his enemy, Takeda Shingen, when Takeda's salt supply had been cut off
Other forms
敵に塩を贈る 【てきにしおをおくる】