en_tn/pro/27/17.md

Iron sharpens iron; in the same way, a man sharpens his friend.

These two phrases are comparing how iron and a man can be improved. AT: "As iron becomes better when it is sharpened by another piece of iron, so a man becomes better when he is made better by his friend" (See: rc://en/ta/man/translate/figs-simile)