eyeball
[verb]
Synonyms: eye, scrutinize, watch

[TahlilGaran] English Synonym Dictionary ▲

I. eye‧ball¹ /ˈaɪbɔːl $ -bɒːl/ 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

[TahlilGaran] Dictionary of Contemporary English ▲

II. eyeball² verb [transitive]
informal to look directly and closely at something or someone:
They eyeballed each other suspiciously.

[TahlilGaran] Dictionary of Contemporary English ▲