The Chinese word 凑热闹 is constructed by attaching the verb 凑 (còu), which denotes 'to join' or 'to add to,' directly to the noun 热闹 (rè nao), meaning 'liveliness' or 'a bustling scene,' resulting in a compound phrase that literally translates as 'to join the excitement' and conveys the action of participating in a lively event.