To spend more money than one earns, resulting in financial deficit; unable to make ends meet.
敷够，足。收入不够支出。
清·曹雪芹《红楼梦》第一百七回但是家计萧条，入不敷出。”
After buying that expensive car, his monthly finances are 入不敷出.
Learn the next connected idiom: 入不敷出 (rù bù fū chū) → 出人意料 (chū rén yì liào)
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