お使い
おつかい · otsukai · JLPT N1 · noun
errand
🛒 お使い = お (polite prefix) + 使い (messenger, one sent out); from 使う, to send or use
使い means someone sent out to do a task, so お使い is a polite small job you are sent off to do, like fetching items from a shop for family.
使 — person radical 亻 + official 吏
Originally a phono-semantic compound: 亻 (person) gives the meaning and 吏 (official, also a phonetic clue) suggests the sound. The early sense was 'to send a person on a mission,' from which came 'envoy/messenger' and the broader meanings 'to use' and 'to cause/make.'