Plunge/plʌndʒ/ Definition 1 of 4Pro Tip 1/2Physical Action Used when describing an action with speed and often without control. The hiker almost plunged off the cliff during the hike. Pro Tip 2/2Emotional Intensity Conveys a sense of urgency or intensity in the action, often used metaphorically. She plunged into despair after hearing the sad news.