晕倒 (yūn dǎo) is a verb meaning 'to faint' — to suddenly lose consciousness, usually due to physical causes like low blood sugar, overheating, emotional shock, or exhaustion. The first character 晕 (yūn) means 'dizzy' or 'giddy', and the second character 倒 (dǎo) means 'to fall down' or 'to collapse'. Together, they vividly depict the physical act of becoming dizzy and then falling unconscious.

This word is commonly used in medical, emergency, or everyday health-related contexts — for example, describing someone collapsing at work, during exercise, or after receiving distressing news. It implies a temporary, involuntary loss of awareness and muscle control, not a serious or life-threatening condition by itself (though it may signal an underlying issue). 晕倒 is neutral in register — appropriate in both spoken and written Chinese — and often appears in news reports, health advice, and personal narratives.