The government will prime the pump to help the economy grow.
prime the pump
idiomTo engage in deficit spending.
Origin
disputed originAs an idiomatic term, from the 1930s. From the metaphor of filling (priming) a liquid pump in order to prepare it for operation.
To encourage consumer spending during the recession, the central bank decided to prime the pump with new financial incentives.
By injecting significant capital into infrastructure projects, the administration hoped to prime the pump and stimulate long-term industrial recovery across the struggling region.