wrap
縳 centers on the action of wrapping something, especially with thread or cloth. The single given meaning "wrap" is the core idea.
縳 combines 糸 (thread) with 專, which likely contributes the sound and the idea of something being wound or concentrated. The character is rare, and the exact historical development is uncertain.
The left side 糸 is thread, and the right side 專 looks like a spindle or a concentrated bundle. Picture thread being wrapped tightly around a spool: 縳 means wrap.
For テン, imagine wrapping a tent with thread: tent -> テン, and the thread wraps around the tent poles.