伴
bàn · HSK 7
accompany
👫 Person + half: your other half is the one who accompanies you
半 (bàn) means half and gives both the sound and the idea. Add the person radical 亻 and you get someone who is your other half — a companion who walks beside you.
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.'