老师

老师 (lǎo shī) is the most common term for 'teacher' in Chinese, used to refer to someone who instructs or educates others, typically in a formal setting such as a school.

The character 老 (lǎo) originally meant 'old' or 'elder,' and was later used as a respectful prefix, similar to 'Master' or 'Sir.' 师 (shī) means 'teacher' or 'master,' often used in contexts of learning or apprenticeship. Together, 老师 conveys a sense of respect and authority.

老师 is widely used in both formal and informal settings. In China, it is customary to address teachers with this term as a sign of respect. It can also be used metaphorically, such as referring to a mentor or someone with expertise in a particular field.