
Fall behind with
Progress Related
Used when someone is not advancing at an expected pace in a specific area.

Without practice, you might fall behind with your piano lessons.
Comparison Implied
Implies a comparison to others' progress or to an established standard.

He's falling behind with his training compared to the rest of the team.
Responsibility
Highlights a personal responsibility towards a task or duty.

If you fall behind with your duties, the entire project could be delayed.
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