Liddell–Scott–Jones: ἐθελο-κᾰκέω

ἐθελο-κᾰκέω, of soldiers who let themselves be beaten,

A. play the coward deliberately, Hdt. 1.127 , 5.78 , 9.67 , Plb. 4.38.6 , Luc. Somn. 18 , Paus. 1.35.2 , etc.

II. do wrong deliberately, act of malice prepense, Ph. 2.523 ,al., PMasp. 151.216

(vi A.D.);ἐ. ἐπὶ συμφοραῖς exult wrongfullyover . . , Ph. 2.73 , cf. 539 .