drag-net made of fine mesh
罭 refers to a specific type of fishing net: a drag-net made of fine mesh. The meaning is narrow and technical, centered on this particular net.
罭 combines 罒 (net) with 或, which likely contributes a phonetic element. The character is a specialized net term, and its exact historical development is uncertain.
The top 罒 is a net. Below it, 或 looks like a mesh of threads being dragged through water. Picture a fine-mesh drag-net sweeping the riverbed.
For ヨク, imagine a fisherman yelling 'YOKE!' as he pulls the heavy drag-net from the water: yoke -> ヨク, and the net comes up full of fish.
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