封笔 literally means 'seal the brush' or 'seal the pen', evoking the traditional image of a writer sealing away their writing instrument to signify permanent retirement from writing. The character 封 (fēng) means 'to seal' or 'to close off', while 笔 (bǐ) means 'writing brush' or 'pen'. Together, they form an elegant, literary idiom expressing the deliberate and often solemn decision to stop writing altogether—whether due to age, health, principle, or artistic fulfillment.

This expression is used almost exclusively in formal, literary, or journalistic contexts—not for casual note-taking or daily journaling, but for professional authors, columnists, poets, or scholars ending their public writing careers. It carries connotations of finality, dignity, and reflection, similar to 'hanging up one’s sword' in martial traditions. Though rooted in classical Chinese culture, 封笔 remains current in modern media and obituaries when describing eminent writers’ retirements.