平坦
píng tǎn · HSK 5
flat
🛣️ 平坦 = 平 (flat/level) + 坦 (level/smooth) — two flat words stacked
Both characters mean flat on their own, so 平坦 doubles down on flatness. 平 shows up in 平静 (calm) and 和平 (peace); 坦 appears in 坦白 (frank, lit. flat-white). Pairing them yields the smooth, even surface sense.
平 — horizontal stroke 一 + 干 with two dots 八
平 originally depicted a balance or scale being level, suggesting evenness. The horizontal lines and symmetrical dots evoke a flat, balanced surface. Over time it extended from 'level/flat' to broader senses like 'calm,' 'peaceful,' and 'ordinary.'