cut, cut out, pick out, scoop out
剜 centers on removing material by cutting or scooping: cutting something out, picking it out, or hollowing it out.
剜 combines 宛 (which likely contributes the sound) with 刂 (knife), suggesting cutting or scooping with a blade. The exact historical development is uncertain.
The left side 宛 looks like a roof over a person, and the right side 刂 is a knife. Imagine using a knife to cut out a piece from under a roof, like scooping out a section.
For ワン, picture a one-handed scoop: one -> ワン, and the knife cuts out a single scoop.