noun
leftover food; food kept for many days
Refers to food that has been stored or left uneaten for several days, often implying it may no longer be fresh. The term is somewhat dated and may appear in historical or household contexts.
冷蔵庫のない時代には、日増し物を食べることも多かった。
In the days before refrigerators, people often ate food that had been kept for several days.
祖母は日増し物を上手に
My grandmother had the wisdom to use up leftover food skillfully.