The phrasal verb "fall behind" is more commonly used in informal speech than in formal contexts, though it is not entirely absent from the latter. It tends to appear in both spoken and written English and is used to describe a situation where a person or entity is unable to maintain the same progress or pace as others, thus becoming delayed or lagging in some manner. It is frequently applied in contexts related to schedules, deadlines, workloads, financial obligations, or competitive situations. For example, one might 'fall behind on rent' or 'fall behind in a race.' Its usage implies a shortcoming compared to a defined standard or necessary pace. In professional settings, particularly in business or education, it might be employed in semi-formal contexts to discuss performance or progress issues without appearing too casual.
B1
PreIntermediate
1. To not complete something on schedule, or to progress more slowly than others.
I fell behind on my rent after I lost my job.
Students who miss classes often fall behind in their studies.
During the race, she fell behind the other runners.
2. To lose one's position in a ranking or competition by not maintaining the same speed or level.
If the team doesn't improve, they'll fall behind in the league standings.
Companies that fail to innovate may fall behind their competitors.
He was a strong contender, but he began to fall behind in the final round.