To collide violently with an obstacle or another object. The car crashed into the tree after skidding on the wet road.
To suddenly stop functioning or fail, especially in the context of a computer or system. The software crashed unexpectedly, causing us to lose all unsaved work.
To attend a social event without an invitation. They decided to crash the wedding reception for some free food and drinks.
To fall asleep suddenly and deeply due to exhaustion. After the long hike, I crashed on the couch and slept for hours.
To cause a market or economy to collapse suddenly. The news of the scandal crashed the stock market, leading to a significant drop in prices.