From a completed doubled pass thru formation: In single file columns of two, each column separates from the adjacent one walking forward in single file to loop around 3/4 of the way and come straight back into the set. Finishes in double pass thru formation. From a single couple facing out: Separate and loop around 3/4 of the way to walk straight back into the set.
BACKGROUND NOTE: The original idea of Cloverleaf was embodied in a move called U-Trail Out by "Decko" Deck of Washington, D.C. The move has remained, but Decko's term has not.
Joe Prystupa 1963
This definition is from The Handbook of Modern Square Dancing by Jay King.
It is provided here for informational and educational purposes only.