venfu -vef-venf- gismu

x₁ takes revenge on/retaliates against x₂ (person) for wrong x₃ (nu) with vengeance x₄ (nu).

Also avenge; (adjective:) x₁ is vengeful. See also sfasa, cnemu.

In notes:

cnemu: x₁ (agent) rewards x₂ [recipient] for atypical x₃ (event/property) with reward/desserts x₄.
lekyvefkemxagraiselne'u: x₀: revenge is a dish best served cold (nullary predicate)
selvenfu: x₁ gets retaliated/avenged by x₂ because of x₃ by method x₄.
sfasa: x₁ (agent) punishes x₂ for infraction x₃ (event/state/action) with punishment x₄ (event/state).
tervenfu: x₁ is the reason that x₂ gets retaliated/avenged by x₃ by method x₄.
velvenfu: x₁ is revenge/retaliation/payback/"taste of one's own medicine" taken on x₂ for x₃ by x₄.