This is the 232nd most frequent Hungarian word.
marad
"Marad" means "to remain" or "to stay" in English.
Here, 'marad' is used as an imperative verb to command someone, in this case the dog, to remain in its position.
Hazaértem, és a kutya már várt, hogy meghívhassam őt: "Maradj!"
I got home, and the dog was already waiting, so I could command it: "Stay!"
In this sentence, 'maradt'—past tense form of 'marad'—describes something that continued to stay in a place (in this case, the fridge).
Az étel a hűtőben maradt, mert már nem volt idő elfogyasztani.
The food stayed in the fridge, because there was no time to eat it.
Here, 'marad' is used in the future tense, indicating the persistence or continuation of a state of affairs or situation.