plan one's expenditure in the light of one's income;spend no more than one's income;stretch one's legs according to the coverlet; base one's expenditure upon one's income; live within income; make ends meet
量：衡量。入：收入。根据收入的多少来决定支出的限度。
连动式；作谓语、定语；指根据收入的多少来决定开支的限度
量：计量。根据收入的多少来定开支的限度。
《礼记·王制》：“五谷皆入，然后制国用，……以三十年之通制国用，量入以为出。”
宜量入为出，汰冗食浮费。 ◎《明史·孙原贞传》