The suffix And back means return to the Starting Positions, using the other hand for the return if appropriate. The common example, Hands across And back means Right hands Across followed by Left hands Across, each dancer Turning On the spot to change direction at the halfway point.
And back in Scottish Country Dancing also means return to the Starting Positions using the Strathspey travelling step or Slip step in the other direction for the return. The common example, Hands round and back means Hands round to the left followed by Hands round to the right.
For example, here are some Scottish Country Dances in which the term, And back, is used in either the Minicrib or the Maxicrib Dance instructions or both -
Eyrie In The Glen
Father Connelly's Jig
From The Black Isle To The Black Sea
Get Yoursel' A Toyboy
Hope Little's Strathspey
Let The Hackles Rise
Prince Rupert's Fancy