Adam Clarke on Ezekiel 17:2

Son of man, put forth a riddle - Riddle, Anglo-Saxon, from to divine; a thing that must be curiously investigated and sifted, to find out the meaning; and hence, riddle, a sort of coarse sieve to clean corn, to separate coarse chaff and straws from the pure grain. An instrument formerly used for divination. This is not far removed from the Hebrew חידה chidah, from חד chad, to penetrate; not that which penetrates the mind, but which we must penetrate to find out the sense.