The teacher introduces us to three idioms connected with eyes.
To keep an eye on: have an eye on someone or something and keep an eye on someone or something to keep watch on someone or something; to keep track of someone or something. (The an can be replaced by oneâ€™s.)
I have my eye on the apple tree. When the apples ripen, Iâ€™ll harvest them. Please keep an eye on the baby. Will you please keep your eye on my house while Iâ€™m on vacation?
To have eyes at the back of one`s head: Able to see everything. To seem to be able to sense what is going on outside of oneâ€™s vision.Â My teacher seems to have eyes in the back of her head. My teacher doesnâ€™t need to have eyes in the back of his head. He watches us very carefully.
Have eyes bigger than oneâ€™s stomach: To have a desire for more food than one could possibly eat. (See also oneâ€™s eyes are bigger then oneâ€™s stomach.)
I know I have eyes bigger than my stomach, so I wonâ€™t take a lot of food. Todd has eyes bigger than his stomach.