godan verb (-su), transitive verb
reheat; warm over
Used for reheating previously cooked food, especially by boiling or simmering again. Common in home cooking contexts.
昨日のカレーを煮返して食べた。
I reheated yesterday's curry and ate it.
味噌汁は煮返すと風味が落ちる。
Miso soup loses flavor when reheated.