She entered the forest, and the darkness was crushing, suffocating her.
This time, it was suffocating him.
It is a colourless gas which possesses a characteristic suffocating odour.
At one and the same moment came the sound of an explosion, a whistle of splinters as from a breaking window frame, a suffocating smell of powder, and Prince Andrew started to one side, raising his arm, and fell on his chest.
Their "firedamp" (formerly fulminating damp) is marsh gas, which, when mixed with air and exploded, produced "choke damp," "after damp," or "suffocating damp" (carbon dioxide).