‘膊子’ (bó zi) is a regional term—primarily used in northern Chinese dialects, especially in rural or agricultural contexts—to refer to the shoulder. It is not standard Mandarin; in formal or national speech, ‘肩膀’ (jiān bǎng) is preferred. The character ‘膊’ means ‘upper arm’ or ‘shoulder area’ and appears in words like ‘胳膊’ (gē bo, ‘arm’); ‘子’ is a common noun suffix that adds a colloquial, diminutive, or concrete nuance.

This word often appears when describing livestock anatomy (e.g., cuts of meat or animal conformation), physical labor involving carrying loads on the shoulder, or folk expressions about strength or endurance. It carries an earthy, rustic tone and may sound outdated or dialectal to urban speakers. Learners should recognize it in regional literature or oral narratives but avoid using it in formal writing or standard conversation unless intentionally evoking local flavor.