'洗手间' (xǐshǒujiān) literally means 'hand-washing room' — a polite, widely accepted euphemism for 'washroom' or 'restroom' in Chinese. It combines three characters: 洗 (xǐ, 'to wash'), 手 (shǒu, 'hand'), and 间 (jiān, 'room' or 'space'). Though the literal meaning emphasizes handwashing, the term functions as a general, respectful way to refer to a facility with a toilet and sink, commonly used in public spaces, offices, restaurants, and homes.

This term is standard across mainland China, Taiwan, and many overseas Chinese communities. It avoids the bluntness of more direct terms like '厕所' (cèsuǒ, 'toilet') and reflects cultural preferences for indirect, hygienic, and face-saving language. Unlike English 'bathroom', which may imply a private home space, '洗手间' is appropriate in both formal and informal settings — from airport signage to polite requests in conversation.