お供
おとも · otomo · JLPT N1 · noun
companion
🐕 お (polite prefix) + 供 (accompany) = one who goes along with you
供 means to accompany or serve, and お adds politeness. So お供 is the polite word for someone who travels or serves alongside you.
供 — person radical 亻 + 共 (together)
A semantic-phonetic compound: 亻 (person) gives the meaning of human action while 共 (together, gōng) supplies the sound. Originally meaning to present or offer jointly, it extended to 'supply, provide.' A second reading gòng means to make an offering or confess.