Fall behind schedule

BEHIND SCHEDULE or FALL BEHIND SCHEDULE is a useful term when talking about delays or lateness, especially in a work context:


The project is behind schedule by three weeks.
Our supplier hasn't delivered the data on time and we are in danger of falling behind schedule.


Meaning: having failed to do something by the scheduled time. Happening or done later than the time that was planned.


The opposite is: ahead of schedule


We finished the project ahead of schedule (We finished earlier than we expected/planned).