Cách sử dụng
The expression "be/go out like a light" means to fall asleep very quickly and deeply. It can be used in casual conversations, especially when talking about how someone slept the night before. For example, "I was so tired last night that I went out like a light as soon as my head hit the pillow." or "After a long day at work, my husband goes out like a light as soon as he gets into bed."