Suffocate/ˈsʌfəkeɪt/ Definition 1 of 3Pro Tip 1/3Physical Danger Used to express a life-threatening situation due to lack of air. Many animals suffocate if trapped underwater for too long. Pro Tip 2/3Metaphorically Speaking Sometimes used metaphorically to describe an overwhelming feeling. He felt suffocated by his responsibilities. Pro Tip 3/3Intensity Emphasis Highlights extreme conditions that make breathing difficult. The smoke was so thick, I thought I'd suffocate.