陪伴
péi bàn · HSK 7
to accompany
👫 陪伴 = 陪 accompany + 伴 companion; two near-synonyms stacked to mean keep company
Both halves carry a companion sense: 陪 means to accompany and 伴 means partner or mate. Note 伴 = 亻person + 半 half, the partner who is your other half (bàn echoes 半 half).
陪 — mound radical 阝 + 咅 (phonetic)
陪 is a phono-semantic compound. The left 阝 (mound/hill) originally suggested earthen embankments piled alongside something, while 咅 supplies the sound. From 'an accompanying mound of earth' the meaning shifted to 'to accompany' or 'keep company with,' the standard sense today.
伴 — person radical 亻 + half 半
A semantic-phonetic compound: 亻(person) gives the meaning and 半 (bàn, 'half') supplies the sound while also hinting at 'one of a pair.' The original sense was 'companion' or 'partner,' someone who is your other half, and from there it extended to 'accompany.'