synonymous with on the same level. friends who are on the level think similarly and get along well.... when presented with a problem, they might arrive at similar solutions.
me and holmes are on the level; he knows me better than I know myself.
ayon kay 23419 ika-29 ng Hunyo, 2004
Used to desribe someone who is a Freemason (member of the Masonic Lodge or related side-orders). The level (a builders tool used to to "prove" horizontals), in Freemasnory, indicates that all human beings are the equal - that not one person is any better than another.
"I notice you're wearing a masonic pin on your jacket - so you're on the level then?"
ayon kay BuckoNZ ika-13 ng Disyembre, 2003