Be overdue and Fall behind

Fall behind and be overdue are semantically related In some cases you can replace term "Fall behind" with "Be overdue", this terms are similar.

Fall behind verb - Hang (back) or fall (behind) in movement, progress, development, etc..

Be overdue and fall behind are semantically related in get into debt topic. Sometimes you can replace phrase "Be overdue" with "Fall behind", this terms are similar.