問い合わせ
といあわせ · toiawase · JLPT N2 · noun
inquiry
☎️ 問い (question) + 合わせ (bring together): a question brought together with an answer
問い means question and 合わせる means to match or join up. An inquiry joins your question with an answer, often by phone or help-desk contact in Japan.
合 — 乛 (lid/roof) + 口 (mouth)
Originally a pictograph of a lidded vessel — a cover (亼) closing over an opening (口) — giving the core sense of 'come together, join, fit.' From 'fit/match' it extended to 'combine, unite, agree' and to measure-word uses. The reading hé reflects this 'joining' meaning.