ˈ ̷ ̷ ̷ ̷ˌ ̷ ̷, ˌ ̷ ̷ ̷ ̷ˈ ̷ ̷ noun
Etymology: under (III) + side
1. : the side or surface lying underneath
underside of a leaf
2. : the side usually hidden from sight : the worse side
with the underside of civilization revealing itself in slum and brothel — R.M.Kain