'休克' (xiū kè) is a medical term meaning 'shock' — a life-threatening condition where the body's organs and tissues don't receive enough blood flow and oxygen, often due to severe injury, infection, or allergic reaction. Though the characters 休 (xiū, 'to rest') and 克 (kè, 'to overcome; gram') appear unrelated individually, together they form a transliteration of the English word 'shock', borrowed phonetically in the early 20th century. This is a classic example of a 'phonetic-loan word' in Chinese medical terminology.

The term is used exclusively in clinical and formal health contexts — doctors, nurses, and medical reports use it routinely. It does not carry everyday figurative meanings like English 'shock' (e.g., emotional shock); for psychological surprise or distress, native terms like '震惊' (zhèn jīng) or '惊吓' (jīng xià) are used instead. Pronunciation must preserve both tones: xiū (first tone) and kè (fourth tone), as mispronouncing either may cause confusion with other words.