お互い
おたがい · otagai · JLPT N3 · noun
mutual
🤝 Sounds like oh, tag-I: you tag me, I tag you back, so it means each other
お is the polite prefix and 互い (tagai) means mutual. The kanji 互 comes from two interlocking hooks, each catching the other. Common uses: お互いに (to each other) and お互い様 (we're in the same boat).