There are several alternative phrases to describe a "debt explosion". One possible synonym is "debt crisis", which implies a situation where the amount of debt has grown out of control and requires immediate attention. Another term that can be used is "debt avalanche", which connotes a situation where a large amount of debt is rapidly accumulating. "Debt overload" is another appropriate term that can be used interchangeably with "debt explosion". This phrase suggests a situation where too much debt has been accumulated and the debtor is struggling to meet their obligations. Regardless of the choice of phrase, a "debt explosion" is generally an undesirable situation that requires careful attention and consideration to bring resolution.