The air grew colder, fouler; poisonous gases were seeping into our atmosphere.

They searched the lab, and in a corner found a closet with the door closed, from which a thin green gas seeped.

Investigators said they believed that the deadly gas seeped into the house through a crack in the furnace flue.

Rather than seeping upward, the odorless gas could seep sideways into residences, he said.

The deadly gas seeped into the cabin from a faulty propane heating and air-conditioning system.

Then, he said, when the car is backed out and the door is closed, the gas slowly seeps into the house.

Eventually, the gas seeped into their pores and they were unconscious.

The resistance petered out as the gas seeped through the building.

Mr. Perry explained that the egg shell provides an environment in which just the right gases seep through.

Water poured in and gas seeped through the cracks.