understander
noun
un·der·stand·er
ˌəndə(r)ˈstandə(r),
-aan-
plural -s
1
: one that understands
2
: one that stands under or supports
specifically : underman sense 2
3
obsolete
a
: foot
b
: boot
4
obsolete : a spectator in the pit of a theater
Word History
Etymology
Middle English understander, understonder, from understanden, understonden + -er