互补
hù bǔ · HSK 7
to complement each other
🧩 互 (mutual) + 补 (to mend/supplement) = mend each other's gaps, complement
补 — clothes radical 衤 + 甫 (phonetic)
补 is a phono-semantic compound. The left side 衤 (clothes radical) gives the meaning, originally referring to patching or mending clothes. The right side 甫 supplies the sound. From 'mend a garment' the meaning broadened to 'repair, supplement, make up for'.