Natural is used in this book to mean "any shoulder" or "any hand".
From a left-handed miniwave, a Natural Step Thru, Pass Thru, or Turn Thru
is a Left Step Thru, Pass Thru, or Turn Thru. From a left-handed 2-faced
line, a Natural 1/2 Tag is a Left 1/2 Tag. Hence, a Couples Twosome
Hinge could be thought of as a Natural 1/2 Tag.
Cross Over Circulate
Definitions that involve Cross Over Circulate sometimes require one to do
it from columns. This is a Circulate and cross into the other column. It
arises in such things as [Reverse] Change-O, Trade the Deucey from a starting DPT,
or Change Lanes from a 3/4 box.
\sxvlines{b3s,b4s,g4n,g1n}
\syhlines{b4n,b3s,g3s,g2n}
before Trade the Deucey
after
If the #1 person in a column is asked to Cross Over Circulate, the action is
a normal Circulate and then cross over, which is just a U-Turn Back. Some
people consider this less than totally esthetic, but it does get used in some definitions.
Quarter To Handhold
This term is typically used in a 3/4 tag, after an extend. It means 1/4
in the direction of the miniwave from which you extended. (Replacing the
extend with 1/2 Box Circulate would get the same effect.)
Revert and Reflect
These are terms used with compound tagging calls, as in "Reflected Loop and Tag Chain Thru Reaction".
They are described in Book 2: Reflect and Revert.
Briefly, these actions are performed when the tagging call reaches the half-tag point. For Revert, all Cast 3/4. For Reflect, all Counter Rotate 1/4, in the tagging formation (typically a 2x2 box). Then continue with the tagging suffix.
\syhlines{g3s,b3s,g2s,b2s}
\syhlines{b1n,b4s,g1n,g2s}
before Reflected Circle the Tag Chain Thru Reaction