hold someone's gaze: to look at someone who is looking at you, without moving your eyes away
hold someone's stare: to look at someone who is staring at you
leer: to look at someone in an unpleasant way that shows you are sexually interested in them
bore into: if someone's eyes bore into you, they look at you very hard and this makes you feel
nervous
eye up: to look at someone in a way to show that you are sexually attracted to them
fix with: if you fix someone with your eyes, you look directly into their eyes so they feel they
cannot turn away