附带
fù dài · HSK 7
incidentally
📎 附 = attach + 带 = belt/bring; attached-along = supplementary
附 (fù) means attach or append; 带 (dài) means belt or bring/carry. Together: something attached and carried along with the main thing — hence supplementary, incidental, or by-the-way.
附 — 阝(mound) + 付 (fù, give/attach)
A semantic-phonetic compound: the 阝 'mound/hill' radical hints at meaning while 付 'fù' supplies the sound. Originally referred to a small mound or hill附属 to a larger one, which extended to the modern senses 'attach, append, be near'.
带 — belt/sash 巾 at bottom + ornaments above
带 originally pictured a belt or sash with hanging ornaments or pendants tied at the waist; the bottom 巾 (cloth) reinforces the textile meaning. From the literal 'belt' it extended to 'carry, bring along' (as a belt holds things) and to 'zone/region' (a strip of land).