pushing on a string
n.— «The attempt to pump money into the banking system failed, and as a result, the phrase “pushing on a string” was coined to describe the futility of inflationary policies in this environment.» —“Wisdom from Richard Russell on the Inflation/Deflation Topic” by Jay Taylor HoweStreet.com Nov. 21, 2005. (source: Double-Tongued Dictionary)
Further reading
John in Omaha, Nebraska, wonders about a phrase that encourages someone to attend an event or risk being left out or feeling uncool: be there or be square. Don’t fall for the fake etymology about people wearing boxes on their heads! Ditto for...
Cat hair may be something you brush off, but cat hair is also a slang term that means “money.” In the same way, cat beer isn’t alcoholic — some people use cat beer as a joking term for “milk.” And imagine walking on a...