This is the 6418th most frequent Chinese word.
挨个
"挨个" means "one by one" or "in sequence."
The term '挨个' here emphasizes the sequential order in which the individuals lined up.
他们挨个排队进入展览馆。
They lined up one by one to enter the exhibition hall.
In this sentence, '挨个' is used to indicate that each student takes turns to answer, sequentially.
老师叫学生挨个回答问题。
The teacher asked students to answer the questions one by one.
'挨个' in this sentence indicates a process performed sequentially for each item in the set.