He threatened to beat him black and blue if he didn't pay the debt.
Он пригрозил избить его до синяков, если тот не заплатит долг.
Definitions
To physically assault someone so severely that they are left with bruises all over their body, often resulting in dark blue and black marks on the skin. The phrase can also be used figuratively to describe someone being harshly criticized or treated very badly.
