From a wave or facing couples: Like a Square Thru without hands, but without alternating shoulders. Keep passing right shoulders with opposite and turning in. A Full Oval Thru involves passing four right shoulders and facing in at the end (instead of walking straight by as in Square Thru) to finish in starting set-up. Oval Thru 3/4 involves passing three right shoulders and then facing in. Half Oval Thru involves passing two right shoulders and then facing in.
This definition is from The Handbook of Modern Square Dancing by Jay King.
It is provided here for informational and educational purposes only.