xenru xer xe'u regret 'rue' x1 regrets/rues (abstraction) x2; x1 is regretful/rueful/sorry/[remorseful] about x2 4c 25 [also: x1 feels remorse about x2 (= zugyxe'u)]; (cf. cmavo list .u'u, zungi)
zungi zug guilt x1 feels guilt/remorse about x2 (abstraction) 9d 1 (cf. cmavo list .u'u, cinmo, xenru, zekri)
As you can see {zugyxe'u} is identical to bare {zungi}. It has never been defined in jvs. So I suggest changing the definition to
xenru xer xe'u regret 'rue' x1 regrets/rues (abstraction) x2; x1 is regretful/rueful/sorry/[remorseful] about x2 4c 25 (cf. cmavo list .u'u, zungi)