帮衬 (bāngchèn) is a verb meaning 'to support' or 'to patronize', especially in the context of helping a small business or local shop succeed by buying from it regularly. The character 帮 means 'to help' or 'to assist', while 衬 literally means 'to line' or 'to set off', but here it functions idiomatically to reinforce the idea of providing backing or bolstering — like lining something to strengthen it. Together, they convey active, loyal support rather than passive goodwill.

This word carries a warm, slightly traditional or regional tone — common in southern China and Taiwan — and implies personal connection, community spirit, and social responsibility. It’s often used when encouraging friends or family to choose a neighborhood vendor over a chain store, or when expressing gratitude to loyal customers. Unlike generic terms like 支持 (zhīchí), 帮衬 emphasizes habitual, concrete action — usually through purchasing — and often appears in spoken language or informal writing.