a bag, basket, or other receptacle for odds and ends.
something that covers a wide variety of items or situations: The list is just a catchall of things I want to see or do on vacation.
covering a wide variety of items or situations: The anthology is a catchall collection.

1830–40, Americanism; noun use of verb phrase catch all Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To catchall
Example sentences
Amazon is a catchall site for anyone shopping for anything from lawn furniture
  to kitchen appliances.
Clearly this last factor is a catchall for complicated social developments, and
  it also overlaps with some of the others.
Others wonder whether the term is simply a catchall psychological description
  for people who are habitual criminals.
Pop culture is a catchall culprit, blamed for everything from pediatric obesity
  to global warning.
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