peep, peek
覘 centers on looking secretly or cautiously: peeping or peeking, often with a sense of observing without being noticed.
覘 combines 占 (to occupy, divine) with 見 (to see), suggesting the idea of looking into or observing something, possibly with a sense of scrutiny or secret watching. The exact historical development is uncertain.
The left side 占 looks like a person peeking over a wall, and the right side 見 is an eye. Together, they show someone secretly peeping.
For テン, imagine peeking into a tent: tent -> テン, and you are peeping through the fabric.