十 : dix ; croix; aiguille (RTK)
口 : bouche
Kanji mnemonics:

---

Old things are misunderstood by the 子s (こ) of the world. *Note:* Come up with a 子 character you can use for all the こ reading mnemonics going forward. This child will show up many times throughout your mnemonic journey, and it will help if you imagine the same character the whole time.