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Difference between Be on all fours and Hit on all four

be on all fours

1. crawl on one’s hands and knees:

  • Claud slipped through the hedge on all fours and I followed.

2. (coll.) correspond or harmonize with smth.:

  • The railways maintain that conditions in Great Britain and America are not on all fours.

hit on all four —(coll.) work most efficiently (also: hit on all six):

  • If we can hit on all four, we can provide incredible value for our members.