ruin, cause fail, overthrown
僨 centers on collapse and downfall: to ruin, cause to fail, or be overthrown. The meanings share the idea of something or someone being brought down from a stable state.
僨 combines 亻 (person) with 賁, which likely contributes the sound and may carry a sense of rushing or bursting forth, suggesting a person being overthrown or ruined.
A person 亻 beside 賁, which looks like a bursting or scattering shape. Imagine a person being suddenly overthrown, their plans ruined and scattered.
For フン, picture a person causing a ruinous explosion with a loud 'fun' bang: fun -> フン, and the person is overthrown in the blast.