The word "背道而驰" is formed by sequentially combining four characters: 背, meaning "to turn one's back"; 道, meaning "road" or "way"; 而, a grammatical particle linking actions; and 驰, meaning "to gallop" or "to speed". Literally, it depicts turning away from a road and rushing off, which constructs a metaphorical meaning of moving in the opposite direction of a target or principle. The formation directly uses these characters' individual meanings to create a vivid image of divergence.