'Xǐ liǎn' literally combines the verb 'xǐ' (to wash) and the noun 'liǎn' (face), forming a common separable verb meaning 'to wash one’s face'. It describes the routine personal hygiene act of cleansing the face with water, often using soap or facial cleanser. This action is typically performed in the morning upon waking and/or in the evening before bed, and is part of broader self-care practices in Chinese daily life.

The phrase is used as a transitive verb but does not take an object — you say 'xǐ liǎn', not 'xǐ liǎn shénme' (since 'liǎn' is already specified). It can appear in various grammatical positions: as a predicate ('Tā zài xǐ liǎn'), as a complement ('Tā xǐ wán liǎn le'), or in imperative form ('Kuài xǐ liǎn ba!'). It’s neutral in register — appropriate for casual speech, family settings, and instructional contexts like health education.