This is the 11949th most frequent Russian word.
затопили
"Flooded" or "submerged."
In this sentence, 'затопили' means 'lit' or 'kindled' and refers to lighting a fireplace or stove for warmth.
Мы затопили камин, чтобы стало теплее.
We lit the fireplace to make it warmer.
Here, 'затопили' conveys 'flooded,' describing a situation where water has overflowed into basements.
Во время ливня затопили все подвалы в доме.
During the downpour, all the basements in the house were flooded.
In this context, 'затопите' is used as a caution not to put out or extinguish a fire.