Expressions (phrases, clauses, etc.), Godan verb with 'ru' ending
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
Also written 敵に塩を贈る【てきにしおをおくる】