捉襟见肘 zhuōjīn-jiànzhǒu[have too many difficulties to cope with;pull down one's jacket to conceal the raggedness,only to expose one's albows] 衣服破烂,拉一下衣襟就露出胳膊肘儿,比喻生活困难或处境窘迫
《庄子·让王》