I. eye ‧ ball 1 /ˈaɪbɔːl $ -bɒːl/ BrE AmE noun [countable]
1 . the round ball that forms the whole of your eye, including the part inside your head
2 . eyeball to eyeball if two people are eyeball to eyeball, they are directly facing each other, especially in an angry or threatening way
3 . up to the/your eyeballs in something informal if someone is up to their eyeballs in something, they have more than they can deal with:
She’s up to her eyeballs in debt.
4 . drugged/doped up to the eyeballs if someone is drugged up to the eyeballs, they have taken a lot of drugs so that their behaviour is severely affected
II. eyeball 2 BrE AmE verb [transitive]
informal to look directly and closely at something or someone:
They eyeballed each other suspiciously.