bare (someone's) knuckles

Translations
показать кулаки
When negotiations failed, he was ready to bare his knuckles.
Когда переговоры провалились, он был готов показать кулаки.
Definitions
To expose or reveal someone's knuckles, typically by making a fist or removing gloves, often implying readiness for a physical fight or confrontation.
Words
knuckle

noun
костяшка
bare

verb
обнажать