敵に塩を送る
  敵に塩を贈る
  てきにしおをおくる
  Expressions (phrases, clauses, etc.)
  Godan verb with `ru' ending
  [from Uesugi Kenshin sending salt to his enemy, Takeda Shingen, when Takeda's salt supply had been cut off]
  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
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