Cách sử dụng
The expression "keel over" means to suddenly fall over or collapse, often due to tiredness or illness. It is usually used to describe someone who falls down because they are suddenly too weak or too tired to stand up. For example, "After the long hike, Sheila felt so exhausted that she keeled over and had to sit for a few moments." or "The old man keeled over on the sidewalk, and the people passing by stopped to help him."