net
罦 centers on a net used for catching things, especially in hunting or trapping contexts. The meaning is straightforward and specific to a type of net.
罦 combines 罒 (net) with 孚, which likely contributes a phonetic element. The character is used for a specific type of net, but the exact historical development of the 孚 component in this context is uncertain.
The top 罒 is a net, and the bottom 孚 looks like a hand reaching down to grab something caught. Picture a net trap snapping shut over prey.
For フ, imagine a net flying through the air with a 'foo' sound as it lands: foo -> フ, and the net catches its target.