glare, angry look
睚 centers on an intense, hostile stare: glaring or giving an angry look.
睚 combines 目 (eye) with 厓, which likely contributes the sound and may relate to a cliff or edge, suggesting a sharp, piercing look.
The eye 目 on the left and the cliff-like 厓 on the right suggest a sharp, cutting glare from the edge of the eye.
For ガイ, imagine a guy giving you an angry glare: guy -> ガイ, and his eyes are fixed on you.
glaring with hatred; glare filled with hatred