Bottom

The term Bottom is a casual synonym for Foot. Farthest from The music in Scottish Country Dancing.

Diagram 23 - Structure Of 3 Couple Longwise Set - Full Size

For example, here are some Scottish Country Dances in which the term, Bottom, is used in either the Minicrib or the Maxicrib Dance instructions or both -
Airdrie Lassies
Annie Shand Scott's Strathspey
Antarctica Bound
Auld Alliance
Bannockburn Reel
Dance Called Irene
Gannochy Reel
Glint Of Gold
One O' Clock Canon
Seagreen

Set Structure

Positions

Bottom
Centre
Centre Line
Corner Position
Corners' Square
Diagonal Line
End
First Corner Position
Foot
Fourth Corner Position
Line Across
Middle
The Music
nth Couple Place
nth Couple Position
nth Place
nth Position
Opposite Side (Line)
Original
Outside (The Set)
Own Side (Line)
Place
Position
Second Corner Position
Side
Side Line
Standing Places
Starting
Third Corner Position
Top
Wrong Sides