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.
Nature has provided several species of animals, birds and reptiles, to feed upon these insects, and various poisonous and suffocating compounds are used to destroy them, but with no great degree of success.
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).