Provided by: tk8.5-doc_8.5.19-1ubuntu1_all 

NAME
lower - Change a window's position in the stacking order
SYNOPSIS
lower window ?belowThis?
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DESCRIPTION
If the belowThis argument is omitted then the command lowers window so that it is below all of its
siblings in the stacking order (it will be obscured by any siblings that overlap it and will not obscure
any siblings). If belowThis is specified then it must be the path name of a window that is either a
sibling of window or the descendant of a sibling of window. In this case the lower command will insert
window into the stacking order just below belowThis (or the ancestor of belowThis that is a sibling of
window); this could end up either raising or lowering window.
SEE ALSO
raise
KEYWORDS
lower, obscure, stacking order
Tk 3.3 lower(3tk)