The word "千疮百孔" is formed by juxtaposing two parallel noun phrases: "千疮" (thousand wounds) and "百孔" (hundred holes). Each phrase consists of a numerical quantifier ("千" meaning thousand, "百" meaning hundred) directly modifying a noun ("疮" meaning wounds, "孔" meaning holes). The combination uses numerical exaggeration to create a compound idiom that vividly depicts something severely damaged or full of flaws.