take aim at, look at
瞄 centers on directing one's gaze with intent: taking aim at a target or looking at something with focused attention.
瞄 combines 目 (eye) with 苗, which likely contributes the sound ビョウ and helps express the idea of aiming or looking.
The eye 目 focuses on a seedling 苗 in the distance, taking careful aim before looking closer.
For ビョウ, imagine aiming at a target shaped like a 秒 (びょう, second) hand on a clock: 秒 -> ビョウ, and your eye locks onto it.