既 (Kanji for already)

Onyomi

My good dog has my house-KEY already in his fangs all ready when I get home from work!

既(すで) に

as mentioned before ★★★☆☆ KANA

already, as mentioned before

既婚(きこん)

already married ☆☆☆☆☆
既 (already) + 婚 (marriage) = 既婚 (already married)

既存(きぞん) のXXX

the existing XXX ☆☆☆☆☆
既 (already) + 存 (be aware of) = 既存 (the existing XXX)

They FINGERPRINT you immediately because you already had FANGS.

In that TOWN fangs are a heresy!