The word is Dawn. Its first letter is "d" and its last letter is "n." Note that dawn can be either a noun or a verb.
A four letter word meaning to grow light as the sun rises is dawn.
Dawn is the four letter word meaning to grow light as the sun rises. Dawn is the beginning of a new day.
dawn
d for dawn
d for dawn
d for dawn
d for dawn
d for dawn
emit
A four letter word meaning not kosher is: tref
kill
aver