subjoin
‘to join on at the end, annex’
Lexical development traced from the Tamil root:
E. subioyne, subioyn, subjoyne, subjoyn < F. subjoin < O.F. subjoindre < Lat. subiungere ‘to append, add at the end, place under’ < sub ‘under’ + iungere ‘to join together’ < joyn < yeug- < Tamil okka