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Difference between Catch up on something and Catch up with something

catch up on somethingdo unfinished work; do things that one has not had time to do until now:

  • Confined to his bed for a whole week, Smith passed the time catching up on his reading.

catch up with something—(also: catch up to something )

1. overtake a bus, etc. by walking fast:

  • Jane caught up with the bus that had almost left her behind.

2. keep pace with smth.:

  • The fate of Africa depends upon economic advance catching up with political advance.