Definition
to not complete the necessary amount of work or payments by a specified time
延迟；落后；拖欠
He got behind on his work and is now unable to complete the project on time.
他在工作上落后了，现在无法按时完成这个项目。
Due to illness, she has gotten behind on her payments a few times.
由于生病，她有几次拖欠了款项。
Students who do not put in the effort may get behind in their studies.
不努力的学生可能会在学业上落后。