expression, ichidan verb
get together the full amount of money; come up with all the money needed
Idiomatic expression used when gathering the exact amount of money required, often to pay off a debt or meet a financial obligation. The image is of aligning the edges of bills or coins so that nothing is missing.
借金を返すために、なんとか耳を揃えた。
I somehow managed to get together the money to pay off the debt.
月末までに家賃を耳を揃えて払わなければならない。
I have to come up with the full rent by the end of the month.