The Chinese word "轻描淡写" is formed by combining two parallel two-character phrases: "轻描" (light depiction) and "淡写" (faint writing). Each phrase consists of an adjective ("轻" meaning light, and "淡" meaning faint) directly modifying a verb ("描" meaning to depict, and "写" meaning to write). This structural pairing creates a compound idiom where both segments reinforce the literal sense of describing something with minimal detail, leading to its metaphorical use for understatement.