Definition
to not complete the necessary amount of work or payments by a specified time
延遲；落後；拖欠
He got behind on his work and is now unable to complete the project on time.
他在工作上落後了，現在無法按時完成這個項目。
Due to illness, she has gotten behind on her payments a few times.
由於生病，她有幾次拖欠了款項。
Students who do not put in the effort may get behind in their studies.
不努力的學生可能會在學業上落後。