Shuowen Jiezi
The first "submissive; obedient" explanation began with the (121 CE) "Shuowen Jiezi" dictionary. It defines 倭 as "shùnmào" "obedient/submissive", graphically explains the "person; human' radical with a "wěi" 委 "bent" phonetic, and quotes the above "Shi Jing" poem.