The Greek that is translated into English as “gnashed their teeth” or “ground their teeth” is translated in Pwo Karen as “their eyes were green/blue with anger” (source: David Clark), in Yao as “they had itchy teeth” (“meaning they very anxious to destroy him”) (source: Nida / Reyburn, p. 56), in Estado de México Otomi as “gnashed their teeth at him to show anger” (to specify their emotion) (source: John Beekman in Notes on Translation, March 1965, p. 2ff.), in Coatlán Mixe as “ground their teeth in anger like wild hogs,” in Rincón Zapotec as “showed their teeth (like a dog) because of their anger” (source for this and before: Viola Waterhouse in Notes on Translation August 1966, p. 86ff.), and in Gullah as suck dey teet or “suck their teeth” (source: David Frank).

In the the widely-used Mandarin Chinese Union Version it is translated with an existing Chinese proverb: yǎoyá qièchǐ (咬牙切齿 / 咬牙切齒) or “gnash teeth, grind teeth.” (Source: Zetzsche)

See also gnashing of teeth and contempt / scorn / ridicule / abuse.