大胆 (dà dǎn) literally combines 大 (dà, 'big') and 胆 (dǎn, 'gallbladder'—a traditional Chinese physiological symbol for courage and nerve). In classical and modern usage, the gallbladder is metaphorically associated with boldness and fearlessness, so 大胆 means having strong courage, confidence, or daring—especially when taking initiative, expressing opinions, or trying something new. It often carries a positive connotation of admirable bravery, though context matters: it can occasionally imply recklessness if tone or situation suggests overstepping boundaries.

This adjective commonly modifies nouns (e.g., 大胆的尝试 'a bold attempt') or functions predicatively (e.g., 他很大胆 'He is very bold'). It’s frequently used in educational, professional, and creative contexts to encourage risk-taking and original thinking. Unlike the noun 胆量 (dǎn liàng, 'courage' as a measurable quality), 大胆 emphasizes an active, outward-facing attitude rather than inner fortitude alone.