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.
In the days before refrigerators, people often ate food that had been kept for several days.
My grandmother had the wisdom to use up leftover food skillfully.
Compound of 日増し (ひまし, 'day by day') + 物 (もの, 'thing'), literally 'thing that increases by the day', referring to food that accumulates or remains over multiple days.