Alternative letter-case form of dein (“your (singular)”)

(archaic) genitive singular of du

thy, your (esp. to friends, relatives, children, etc.).

nominative/accusative neuter singular of dein

your wish is my command

from your lips to God's ears; expresses that the speaker wants a preceding statement to be true, but considers it doubtful or even unlikely in most cases there is no unlikely element. It is just a hope (prayer) that the statement come true.