"Runaway spending" refers to a situation where someone or an organization is spending money at an excessive and uncontrollable rate. It means spending more than one can afford or beyond what was planned or budgeted. Full definition
If the plight of the middle class isn't the result of runaway spending, or of a refusal to go out and work, what is behind it? (moneysense.ca)
High oil prices gave the oil industry several bad habits, including runaway spending, poor planning, and engineering mistakes. (fortune.com)
New York has lost population due to the high taxes imposed by runaway spending on programs that do not accomplish what was promised or contribute to the economic well being of the state. (nystateofpolitics.com)