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.