see, look, gaze at, askance
睊 centers on looking or gazing, often with a sideways or suspicious glance. The meanings 'see', 'look', and 'gaze at' describe direct observation, while 'askance' adds a nuance of looking indirectly or with distrust.
睊 combines 目 (eye) with 肙, which likely contributes the sound and may relate to a small or curved shape, suggesting a sidelong glance. The exact historical development is uncertain.
The eye 目 on the left and the curved shape 肙 on the right suggest an eye looking sideways. Picture an eye glancing askance, peering around a corner.
For エン, imagine an eye glancing askance at the end of a long hallway: end -> エン, and the eye catches a suspicious movement.